Opinion Poll by Opinium for The Observer, 11–13 September 2018
Voting Intentions | Seats | Coalitions | Technical Information
Voting Intentions

Confidence Intervals
| Party | Last Result | Poll Result | 80% Confidence Interval | 90% Confidence Interval | 95% Confidence Interval | 99% Confidence Interval | 
|---|---|---|---|---|---|---|
| Conservative Party | 42.4% | 39.4% | 38.0–40.8% | 37.6–41.2% | 37.3–41.5% | 36.6–42.2% | 
| Labour Party | 40.0% | 38.4% | 37.0–39.8% | 36.6–40.2% | 36.3–40.5% | 35.6–41.2% | 
| Liberal Democrats | 7.4% | 7.1% | 6.4–7.8% | 6.2–8.1% | 6.0–8.3% | 5.7–8.7% | 
| UK Independence Party | 1.8% | 6.1% | 5.4–6.8% | 5.2–7.0% | 5.1–7.2% | 4.8–7.6% | 
| Scottish National Party | 3.0% | 4.0% | 3.5–4.6% | 3.4–4.8% | 3.2–5.0% | 3.0–5.3% | 
| Green Party | 1.6% | 3.0% | 2.6–3.6% | 2.5–3.7% | 2.4–3.9% | 2.2–4.2% | 
| Plaid Cymru | 0.5% | 1.0% | 0.8–1.4% | 0.7–1.4% | 0.6–1.5% | 0.5–1.7% | 
Note: The poll result column reflects the actual value used in the calculations. Published results may vary slightly, and in addition be rounded to fewer digits.
Seats

Confidence Intervals
| Party | Last Result | Median | 80% Confidence Interval | 90% Confidence Interval | 95% Confidence Interval | 99% Confidence Interval | 
|---|---|---|---|---|---|---|
| Conservative Party | 317 | 297 | 273–320 | 268–324 | 265–328 | 260–335 | 
| Labour Party | 262 | 265 | 243–286 | 239–291 | 237–294 | 231–299 | 
| Liberal Democrats | 12 | 11 | 5–15 | 4–16 | 4–17 | 2–19 | 
| UK Independence Party | 0 | 1 | 1 | 1 | 1 | 1 | 
| Scottish National Party | 35 | 54 | 47–57 | 45–58 | 41–58 | 39–58 | 
| Green Party | 1 | 1 | 1 | 1 | 1 | 1 | 
| Plaid Cymru | 4 | 5 | 5 | 4–6 | 4–8 | 4–8 | 
Conservative Party
For a full overview of the results for this party, see the Conservative Party page.

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 252 | 0% | 100% | |
| 253 | 0% | 99.9% | |
| 254 | 0% | 99.9% | |
| 255 | 0% | 99.9% | |
| 256 | 0% | 99.9% | |
| 257 | 0.1% | 99.8% | |
| 258 | 0.1% | 99.8% | |
| 259 | 0.1% | 99.6% | |
| 260 | 0.1% | 99.5% | |
| 261 | 0.2% | 99.4% | |
| 262 | 0.5% | 99.2% | |
| 263 | 0.4% | 98.7% | |
| 264 | 0.6% | 98% | |
| 265 | 0.7% | 98% | |
| 266 | 0.8% | 97% | |
| 267 | 0.8% | 96% | |
| 268 | 0.5% | 95% | |
| 269 | 0.9% | 95% | |
| 270 | 1.0% | 94% | |
| 271 | 1.1% | 93% | |
| 272 | 1.1% | 92% | |
| 273 | 1.0% | 91% | |
| 274 | 1.4% | 90% | |
| 275 | 1.4% | 88% | |
| 276 | 2% | 87% | |
| 277 | 2% | 85% | |
| 278 | 1.5% | 83% | |
| 279 | 2% | 82% | |
| 280 | 1.4% | 80% | |
| 281 | 2% | 78% | |
| 282 | 1.3% | 77% | |
| 283 | 2% | 75% | |
| 284 | 2% | 73% | |
| 285 | 1.4% | 72% | |
| 286 | 2% | 70% | |
| 287 | 2% | 69% | |
| 288 | 2% | 66% | |
| 289 | 1.3% | 65% | |
| 290 | 3% | 63% | |
| 291 | 2% | 60% | |
| 292 | 0.7% | 58% | |
| 293 | 2% | 57% | |
| 294 | 2% | 56% | |
| 295 | 2% | 54% | |
| 296 | 1.1% | 52% | |
| 297 | 4% | 51% | Median | 
| 298 | 0.7% | 46% | |
| 299 | 1.0% | 45% | |
| 300 | 3% | 44% | |
| 301 | 3% | 41% | |
| 302 | 1.0% | 39% | |
| 303 | 4% | 38% | |
| 304 | 2% | 33% | |
| 305 | 2% | 32% | |
| 306 | 2% | 30% | |
| 307 | 1.5% | 28% | |
| 308 | 3% | 27% | |
| 309 | 0.6% | 24% | |
| 310 | 0.9% | 24% | |
| 311 | 1.2% | 23% | |
| 312 | 2% | 21% | |
| 313 | 0.9% | 19% | |
| 314 | 2% | 19% | |
| 315 | 1.1% | 17% | |
| 316 | 0.7% | 16% | |
| 317 | 0.9% | 15% | Last Result | 
| 318 | 3% | 14% | |
| 319 | 0.9% | 12% | |
| 320 | 1.2% | 11% | |
| 321 | 2% | 10% | |
| 322 | 0.9% | 8% | |
| 323 | 1.1% | 7% | |
| 324 | 0.9% | 6% | |
| 325 | 1.3% | 5% | |
| 326 | 0.3% | 4% | Majority | 
| 327 | 0.4% | 3% | |
| 328 | 0.4% | 3% | |
| 329 | 0.7% | 2% | |
| 330 | 0.4% | 2% | |
| 331 | 0.2% | 1.4% | |
| 332 | 0.3% | 1.2% | |
| 333 | 0.1% | 0.9% | |
| 334 | 0.2% | 0.8% | |
| 335 | 0.2% | 0.6% | |
| 336 | 0.1% | 0.4% | |
| 337 | 0% | 0.3% | |
| 338 | 0.1% | 0.2% | |
| 339 | 0% | 0.2% | |
| 340 | 0% | 0.1% | |
| 341 | 0% | 0.1% | |
| 342 | 0% | 0.1% | |
| 343 | 0% | 0% | 
Labour Party
For a full overview of the results for this party, see the Labour Party page.

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 225 | 0% | 100% | |
| 226 | 0.1% | 99.9% | |
| 227 | 0.1% | 99.9% | |
| 228 | 0.1% | 99.8% | |
| 229 | 0.1% | 99.8% | |
| 230 | 0.1% | 99.7% | |
| 231 | 0.2% | 99.6% | |
| 232 | 0.1% | 99.4% | |
| 233 | 0.1% | 99.3% | |
| 234 | 0.2% | 99.2% | |
| 235 | 0.2% | 99.0% | |
| 236 | 0.5% | 98.8% | |
| 237 | 2% | 98% | |
| 238 | 1.4% | 97% | |
| 239 | 2% | 95% | |
| 240 | 2% | 94% | |
| 241 | 0.5% | 91% | |
| 242 | 0.2% | 91% | |
| 243 | 0.8% | 91% | |
| 244 | 2% | 90% | |
| 245 | 1.0% | 88% | |
| 246 | 0.8% | 87% | |
| 247 | 0.8% | 86% | |
| 248 | 4% | 85% | |
| 249 | 0.4% | 81% | |
| 250 | 1.3% | 81% | |
| 251 | 3% | 80% | |
| 252 | 0.8% | 77% | |
| 253 | 0.3% | 76% | |
| 254 | 0.5% | 76% | |
| 255 | 2% | 75% | |
| 256 | 5% | 73% | |
| 257 | 2% | 68% | |
| 258 | 0.5% | 66% | |
| 259 | 3% | 66% | |
| 260 | 2% | 63% | |
| 261 | 1.1% | 61% | |
| 262 | 6% | 60% | Last Result | 
| 263 | 0.9% | 54% | |
| 264 | 0.9% | 53% | |
| 265 | 3% | 52% | Median | 
| 266 | 3% | 49% | |
| 267 | 0.4% | 46% | |
| 268 | 0.3% | 46% | |
| 269 | 0.7% | 45% | |
| 270 | 2% | 45% | |
| 271 | 7% | 43% | |
| 272 | 2% | 36% | |
| 273 | 2% | 34% | |
| 274 | 1.3% | 32% | |
| 275 | 0.8% | 31% | |
| 276 | 2% | 30% | |
| 277 | 2% | 28% | |
| 278 | 0.9% | 26% | |
| 279 | 3% | 25% | |
| 280 | 2% | 22% | |
| 281 | 0.8% | 21% | |
| 282 | 0.6% | 20% | |
| 283 | 4% | 19% | |
| 284 | 2% | 16% | |
| 285 | 2% | 14% | |
| 286 | 1.3% | 11% | |
| 287 | 0.8% | 10% | |
| 288 | 0.4% | 9% | |
| 289 | 0.8% | 9% | |
| 290 | 2% | 8% | |
| 291 | 0.8% | 6% | |
| 292 | 0.8% | 5% | |
| 293 | 1.2% | 4% | |
| 294 | 0.9% | 3% | |
| 295 | 0.5% | 2% | |
| 296 | 0.2% | 1.5% | |
| 297 | 0.5% | 1.3% | |
| 298 | 0.3% | 0.8% | |
| 299 | 0.1% | 0.5% | |
| 300 | 0% | 0.5% | |
| 301 | 0.1% | 0.4% | |
| 302 | 0.1% | 0.3% | |
| 303 | 0.1% | 0.2% | |
| 304 | 0% | 0.1% | |
| 305 | 0% | 0.1% | |
| 306 | 0% | 0.1% | |
| 307 | 0% | 0.1% | |
| 308 | 0% | 0% | 
Liberal Democrats
For a full overview of the results for this party, see the Liberal Democrats page.

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 2 | 1.0% | 100% | |
| 3 | 0.9% | 98.9% | |
| 4 | 3% | 98% | |
| 5 | 6% | 95% | |
| 6 | 3% | 89% | |
| 7 | 5% | 86% | |
| 8 | 3% | 81% | |
| 9 | 13% | 78% | |
| 10 | 8% | 65% | |
| 11 | 19% | 57% | Median | 
| 12 | 9% | 38% | Last Result | 
| 13 | 6% | 29% | |
| 14 | 10% | 23% | |
| 15 | 6% | 13% | |
| 16 | 3% | 7% | |
| 17 | 1.4% | 4% | |
| 18 | 1.0% | 2% | |
| 19 | 0.7% | 1.1% | |
| 20 | 0.2% | 0.4% | |
| 21 | 0.1% | 0.2% | |
| 22 | 0.1% | 0.2% | |
| 23 | 0% | 0.1% | |
| 24 | 0% | 0.1% | |
| 25 | 0% | 0% | 
UK Independence Party
For a full overview of the results for this party, see the UK Independence Party page.

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 0 | 0% | 100% | Last Result | 
| 1 | 99.9% | 100% | Median | 
| 2 | 0.1% | 0.1% | |
| 3 | 0% | 0% | 
Scottish National Party
For a full overview of the results for this party, see the Scottish National Party page.

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 26 | 0% | 100% | |
| 27 | 0% | 99.9% | |
| 28 | 0% | 99.9% | |
| 29 | 0% | 99.9% | |
| 30 | 0% | 99.8% | |
| 31 | 0% | 99.8% | |
| 32 | 0% | 99.8% | |
| 33 | 0% | 99.8% | |
| 34 | 0% | 99.8% | |
| 35 | 0% | 99.7% | Last Result | 
| 36 | 0% | 99.7% | |
| 37 | 0% | 99.7% | |
| 38 | 0.1% | 99.6% | |
| 39 | 0.1% | 99.6% | |
| 40 | 0.6% | 99.4% | |
| 41 | 2% | 98.8% | |
| 42 | 1.4% | 97% | |
| 43 | 0.6% | 96% | |
| 44 | 0.1% | 95% | |
| 45 | 3% | 95% | |
| 46 | 2% | 92% | |
| 47 | 1.5% | 90% | |
| 48 | 5% | 89% | |
| 49 | 4% | 83% | |
| 50 | 0.8% | 79% | |
| 51 | 6% | 78% | |
| 52 | 5% | 72% | |
| 53 | 1.1% | 68% | |
| 54 | 27% | 67% | Median | 
| 55 | 25% | 40% | |
| 56 | 3% | 15% | |
| 57 | 4% | 12% | |
| 58 | 7% | 7% | |
| 59 | 0% | 0% | 
Green Party
For a full overview of the results for this party, see the Green Party page.

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 1 | 99.9% | 100% | Last Result, Median | 
| 2 | 0.1% | 0.1% | |
| 3 | 0% | 0% | 
Plaid Cymru
For a full overview of the results for this party, see the Plaid Cymru page.

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 2 | 0.1% | 100% | |
| 3 | 0.2% | 99.9% | |
| 4 | 6% | 99.7% | Last Result | 
| 5 | 86% | 93% | Median | 
| 6 | 3% | 8% | |
| 7 | 0.7% | 5% | |
| 8 | 4% | 4% | |
| 9 | 0.2% | 0.2% | |
| 10 | 0% | 0% | 
Coalitions

Confidence Intervals
| Coalition | Last Result | Median | Majority? | 80% Confidence Interval | 90% Confidence Interval | 95% Confidence Interval | 99% Confidence Interval | 
|---|---|---|---|---|---|---|---|
| Conservative Party – Scottish National Party – Plaid Cymru | 356 | 354 | 96% | 331–378 | 326–382 | 323–386 | 317–391 | 
| Conservative Party – Scottish National Party | 352 | 349 | 91% | 326–373 | 321–377 | 318–381 | 312–386 | 
| Labour Party – Liberal Democrats – Scottish National Party – Plaid Cymru | 313 | 333 | 68% | 310–357 | 306–362 | 302–365 | 295–370 | 
| Labour Party – Liberal Democrats – Scottish National Party | 309 | 328 | 55% | 305–352 | 300–357 | 296–360 | 290–365 | 
| Labour Party – Scottish National Party – Plaid Cymru | 301 | 322 | 44% | 300–346 | 297–350 | 294–353 | 285–357 | 
| Labour Party – Scottish National Party | 297 | 317 | 36% | 294–341 | 291–345 | 288–348 | 280–353 | 
| Conservative Party – Liberal Democrats | 329 | 308 | 16% | 284–330 | 280–333 | 277–336 | 273–345 | 
| Conservative Party – Plaid Cymru | 321 | 302 | 10% | 278–325 | 273–330 | 270–334 | 265–340 | 
| Conservative Party | 317 | 297 | 4% | 273–320 | 268–324 | 265–328 | 260–335 | 
| Labour Party – Liberal Democrats – Plaid Cymru | 278 | 281 | 0.1% | 257–304 | 253–309 | 249–312 | 244–318 | 
| Labour Party – Liberal Democrats | 274 | 276 | 0% | 252–299 | 248–304 | 244–307 | 239–313 | 
| Labour Party – Plaid Cymru | 266 | 270 | 0% | 248–291 | 244–296 | 242–299 | 236–304 | 
| Labour Party | 262 | 265 | 0% | 243–286 | 239–291 | 237–294 | 231–299 | 
Conservative Party – Scottish National Party – Plaid Cymru

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 308 | 0% | 100% | |
| 309 | 0% | 99.9% | |
| 310 | 0% | 99.9% | |
| 311 | 0% | 99.9% | |
| 312 | 0% | 99.9% | |
| 313 | 0% | 99.8% | |
| 314 | 0.1% | 99.8% | |
| 315 | 0.1% | 99.7% | |
| 316 | 0.1% | 99.7% | |
| 317 | 0.2% | 99.6% | |
| 318 | 0.1% | 99.4% | |
| 319 | 0.3% | 99.3% | |
| 320 | 0.3% | 99.0% | |
| 321 | 0.3% | 98.7% | |
| 322 | 0.6% | 98% | |
| 323 | 0.5% | 98% | |
| 324 | 0.6% | 97% | |
| 325 | 1.3% | 97% | |
| 326 | 1.0% | 96% | Majority | 
| 327 | 0.5% | 95% | |
| 328 | 0.8% | 94% | |
| 329 | 0.8% | 93% | |
| 330 | 2% | 92% | |
| 331 | 1.2% | 91% | |
| 332 | 0.9% | 89% | |
| 333 | 1.1% | 89% | |
| 334 | 2% | 88% | |
| 335 | 1.4% | 86% | |
| 336 | 3% | 84% | |
| 337 | 0.7% | 81% | |
| 338 | 2% | 80% | |
| 339 | 1.0% | 79% | |
| 340 | 3% | 78% | |
| 341 | 2% | 75% | |
| 342 | 1.4% | 73% | |
| 343 | 1.0% | 71% | |
| 344 | 2% | 70% | |
| 345 | 2% | 68% | |
| 346 | 2% | 66% | |
| 347 | 2% | 64% | |
| 348 | 2% | 62% | |
| 349 | 1.4% | 61% | |
| 350 | 4% | 59% | |
| 351 | 1.3% | 55% | |
| 352 | 0.7% | 54% | |
| 353 | 3% | 53% | |
| 354 | 3% | 51% | |
| 355 | 1.5% | 48% | |
| 356 | 2% | 46% | Last Result, Median | 
| 357 | 2% | 45% | |
| 358 | 0.8% | 43% | |
| 359 | 3% | 42% | |
| 360 | 3% | 38% | |
| 361 | 0.7% | 36% | |
| 362 | 2% | 35% | |
| 363 | 4% | 33% | |
| 364 | 2% | 30% | |
| 365 | 2% | 28% | |
| 366 | 0.8% | 26% | |
| 367 | 2% | 25% | |
| 368 | 3% | 24% | |
| 369 | 0.8% | 21% | |
| 370 | 1.1% | 20% | |
| 371 | 2% | 19% | |
| 372 | 1.1% | 17% | |
| 373 | 1.3% | 16% | |
| 374 | 0.9% | 15% | |
| 375 | 0.9% | 14% | |
| 376 | 1.0% | 13% | |
| 377 | 2% | 12% | |
| 378 | 1.2% | 10% | |
| 379 | 1.0% | 9% | |
| 380 | 2% | 8% | |
| 381 | 0.8% | 6% | |
| 382 | 1.3% | 6% | |
| 383 | 0.5% | 4% | |
| 384 | 0.5% | 4% | |
| 385 | 0.4% | 3% | |
| 386 | 0.8% | 3% | |
| 387 | 0.4% | 2% | |
| 388 | 0.5% | 1.5% | |
| 389 | 0.2% | 1.0% | |
| 390 | 0.1% | 0.7% | |
| 391 | 0.1% | 0.6% | |
| 392 | 0.2% | 0.5% | |
| 393 | 0.1% | 0.3% | |
| 394 | 0% | 0.3% | |
| 395 | 0.1% | 0.2% | |
| 396 | 0% | 0.1% | |
| 397 | 0% | 0.1% | |
| 398 | 0% | 0.1% | |
| 399 | 0% | 0.1% | |
| 400 | 0% | 0% | 
Conservative Party – Scottish National Party

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 304 | 0% | 100% | |
| 305 | 0% | 99.9% | |
| 306 | 0% | 99.9% | |
| 307 | 0% | 99.9% | |
| 308 | 0% | 99.8% | |
| 309 | 0.1% | 99.8% | |
| 310 | 0.1% | 99.8% | |
| 311 | 0.1% | 99.7% | |
| 312 | 0.2% | 99.6% | |
| 313 | 0.2% | 99.4% | |
| 314 | 0.2% | 99.3% | |
| 315 | 0.3% | 99.0% | |
| 316 | 0.3% | 98.8% | |
| 317 | 0.6% | 98% | |
| 318 | 0.4% | 98% | |
| 319 | 0.7% | 97% | |
| 320 | 1.2% | 97% | |
| 321 | 1.0% | 96% | |
| 322 | 0.6% | 95% | |
| 323 | 0.8% | 94% | |
| 324 | 0.9% | 93% | |
| 325 | 2% | 92% | |
| 326 | 1.2% | 91% | Majority | 
| 327 | 0.8% | 89% | |
| 328 | 1.2% | 89% | |
| 329 | 2% | 87% | |
| 330 | 2% | 86% | |
| 331 | 3% | 84% | |
| 332 | 0.7% | 81% | |
| 333 | 2% | 80% | |
| 334 | 1.1% | 79% | |
| 335 | 3% | 78% | |
| 336 | 2% | 75% | |
| 337 | 2% | 73% | |
| 338 | 1.0% | 71% | |
| 339 | 2% | 70% | |
| 340 | 2% | 68% | |
| 341 | 1.2% | 66% | |
| 342 | 2% | 65% | |
| 343 | 2% | 62% | |
| 344 | 1.5% | 61% | |
| 345 | 4% | 59% | |
| 346 | 2% | 55% | |
| 347 | 0.6% | 54% | |
| 348 | 3% | 53% | |
| 349 | 3% | 50% | |
| 350 | 1.3% | 48% | |
| 351 | 2% | 46% | Median | 
| 352 | 2% | 45% | Last Result | 
| 353 | 1.0% | 42% | |
| 354 | 3% | 41% | |
| 355 | 3% | 38% | |
| 356 | 0.7% | 36% | |
| 357 | 2% | 35% | |
| 358 | 4% | 33% | |
| 359 | 2% | 29% | |
| 360 | 2% | 27% | |
| 361 | 0.7% | 26% | |
| 362 | 1.5% | 25% | |
| 363 | 3% | 24% | |
| 364 | 0.9% | 21% | |
| 365 | 1.2% | 20% | |
| 366 | 2% | 19% | |
| 367 | 1.1% | 17% | |
| 368 | 1.2% | 16% | |
| 369 | 0.8% | 15% | |
| 370 | 0.9% | 14% | |
| 371 | 1.0% | 13% | |
| 372 | 2% | 12% | |
| 373 | 1.3% | 10% | |
| 374 | 0.9% | 9% | |
| 375 | 2% | 8% | |
| 376 | 0.9% | 6% | |
| 377 | 1.2% | 5% | |
| 378 | 0.5% | 4% | |
| 379 | 0.5% | 3% | |
| 380 | 0.4% | 3% | |
| 381 | 1.0% | 3% | |
| 382 | 0.4% | 2% | |
| 383 | 0.5% | 1.3% | |
| 384 | 0.2% | 0.8% | |
| 385 | 0.1% | 0.6% | |
| 386 | 0.1% | 0.5% | |
| 387 | 0.2% | 0.4% | |
| 388 | 0% | 0.3% | |
| 389 | 0% | 0.2% | |
| 390 | 0.1% | 0.2% | |
| 391 | 0% | 0.1% | |
| 392 | 0% | 0.1% | |
| 393 | 0% | 0.1% | |
| 394 | 0% | 0% | 
Labour Party – Liberal Democrats – Scottish National Party – Plaid Cymru

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 288 | 0% | 100% | |
| 289 | 0% | 99.9% | |
| 290 | 0% | 99.9% | |
| 291 | 0% | 99.9% | |
| 292 | 0.1% | 99.8% | |
| 293 | 0% | 99.8% | |
| 294 | 0.1% | 99.7% | |
| 295 | 0.2% | 99.6% | |
| 296 | 0.2% | 99.4% | |
| 297 | 0.1% | 99.2% | |
| 298 | 0.3% | 99.1% | |
| 299 | 0.2% | 98.8% | |
| 300 | 0.4% | 98.6% | |
| 301 | 0.7% | 98% | |
| 302 | 0.4% | 98% | |
| 303 | 0.4% | 97% | |
| 304 | 0.3% | 97% | |
| 305 | 1.3% | 96% | |
| 306 | 0.9% | 95% | |
| 307 | 1.1% | 94% | |
| 308 | 0.9% | 93% | |
| 309 | 2% | 92% | |
| 310 | 1.2% | 90% | |
| 311 | 0.9% | 89% | |
| 312 | 3% | 88% | |
| 313 | 0.9% | 86% | Last Result | 
| 314 | 0.6% | 85% | |
| 315 | 1.1% | 84% | |
| 316 | 2% | 83% | |
| 317 | 0.9% | 81% | |
| 318 | 2% | 81% | |
| 319 | 1.2% | 79% | |
| 320 | 0.9% | 77% | |
| 321 | 0.6% | 76% | |
| 322 | 3% | 76% | |
| 323 | 1.5% | 73% | |
| 324 | 2% | 72% | |
| 325 | 2% | 70% | |
| 326 | 2% | 68% | Majority | 
| 327 | 4% | 67% | |
| 328 | 1.0% | 62% | |
| 329 | 3% | 61% | |
| 330 | 3% | 59% | |
| 331 | 1.0% | 56% | |
| 332 | 0.7% | 55% | |
| 333 | 4% | 54% | |
| 334 | 1.1% | 49% | |
| 335 | 2% | 48% | Median | 
| 336 | 2% | 46% | |
| 337 | 2% | 44% | |
| 338 | 0.7% | 43% | |
| 339 | 2% | 42% | |
| 340 | 3% | 40% | |
| 341 | 1.3% | 37% | |
| 342 | 2% | 35% | |
| 343 | 2% | 34% | |
| 344 | 2% | 31% | |
| 345 | 1.4% | 30% | |
| 346 | 2% | 28% | |
| 347 | 2% | 27% | |
| 348 | 1.3% | 25% | |
| 349 | 2% | 23% | |
| 350 | 1.4% | 22% | |
| 351 | 2% | 20% | |
| 352 | 1.5% | 18% | |
| 353 | 2% | 17% | |
| 354 | 2% | 15% | |
| 355 | 1.4% | 13% | |
| 356 | 1.4% | 12% | |
| 357 | 1.0% | 10% | |
| 358 | 1.1% | 9% | |
| 359 | 1.1% | 8% | |
| 360 | 1.0% | 7% | |
| 361 | 0.9% | 6% | |
| 362 | 0.5% | 5% | |
| 363 | 0.8% | 5% | |
| 364 | 0.8% | 4% | |
| 365 | 0.7% | 3% | |
| 366 | 0.6% | 2% | |
| 367 | 0.4% | 2% | |
| 368 | 0.5% | 1.3% | |
| 369 | 0.2% | 0.8% | |
| 370 | 0.1% | 0.6% | |
| 371 | 0.1% | 0.5% | |
| 372 | 0.1% | 0.4% | |
| 373 | 0.1% | 0.2% | |
| 374 | 0% | 0.2% | |
| 375 | 0% | 0.1% | |
| 376 | 0% | 0.1% | |
| 377 | 0% | 0.1% | |
| 378 | 0% | 0.1% | |
| 379 | 0% | 0% | 
Labour Party – Liberal Democrats – Scottish National Party

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 282 | 0% | 100% | |
| 283 | 0% | 99.9% | |
| 284 | 0% | 99.9% | |
| 285 | 0% | 99.9% | |
| 286 | 0% | 99.9% | |
| 287 | 0.1% | 99.8% | |
| 288 | 0.1% | 99.7% | |
| 289 | 0.1% | 99.7% | |
| 290 | 0.2% | 99.6% | |
| 291 | 0.2% | 99.4% | |
| 292 | 0.2% | 99.1% | |
| 293 | 0.3% | 99.0% | |
| 294 | 0.2% | 98.6% | |
| 295 | 0.3% | 98% | |
| 296 | 0.6% | 98% | |
| 297 | 0.5% | 97% | |
| 298 | 0.5% | 97% | |
| 299 | 0.3% | 96% | |
| 300 | 1.2% | 96% | |
| 301 | 0.8% | 95% | |
| 302 | 1.2% | 94% | |
| 303 | 0.9% | 93% | |
| 304 | 2% | 92% | |
| 305 | 1.1% | 90% | |
| 306 | 0.9% | 89% | |
| 307 | 2% | 88% | |
| 308 | 1.1% | 86% | |
| 309 | 0.6% | 85% | Last Result | 
| 310 | 1.1% | 84% | |
| 311 | 2% | 83% | |
| 312 | 0.9% | 81% | |
| 313 | 2% | 80% | |
| 314 | 1.5% | 79% | |
| 315 | 1.0% | 77% | |
| 316 | 0.6% | 76% | |
| 317 | 2% | 76% | |
| 318 | 2% | 73% | |
| 319 | 2% | 72% | |
| 320 | 2% | 70% | |
| 321 | 2% | 68% | |
| 322 | 4% | 66% | |
| 323 | 1.0% | 62% | |
| 324 | 3% | 61% | |
| 325 | 3% | 58% | |
| 326 | 1.2% | 55% | Majority | 
| 327 | 0.7% | 54% | |
| 328 | 4% | 54% | |
| 329 | 1.3% | 49% | |
| 330 | 2% | 48% | Median | 
| 331 | 2% | 46% | |
| 332 | 2% | 44% | |
| 333 | 0.8% | 42% | |
| 334 | 2% | 42% | |
| 335 | 3% | 40% | |
| 336 | 1.4% | 37% | |
| 337 | 2% | 35% | |
| 338 | 2% | 34% | |
| 339 | 2% | 32% | |
| 340 | 1.3% | 29% | |
| 341 | 2% | 28% | |
| 342 | 2% | 26% | |
| 343 | 1.1% | 25% | |
| 344 | 2% | 24% | |
| 345 | 1.5% | 22% | |
| 346 | 2% | 20% | |
| 347 | 1.5% | 18% | |
| 348 | 2% | 17% | |
| 349 | 2% | 14% | |
| 350 | 1.1% | 13% | |
| 351 | 2% | 12% | |
| 352 | 1.0% | 10% | |
| 353 | 1.4% | 9% | |
| 354 | 0.9% | 8% | |
| 355 | 0.9% | 7% | |
| 356 | 1.0% | 6% | |
| 357 | 0.5% | 5% | |
| 358 | 0.7% | 5% | |
| 359 | 0.8% | 4% | |
| 360 | 0.6% | 3% | |
| 361 | 0.5% | 2% | |
| 362 | 0.5% | 2% | |
| 363 | 0.4% | 1.3% | |
| 364 | 0.3% | 0.9% | |
| 365 | 0.1% | 0.6% | |
| 366 | 0.1% | 0.5% | |
| 367 | 0.1% | 0.4% | |
| 368 | 0.1% | 0.3% | |
| 369 | 0% | 0.2% | |
| 370 | 0% | 0.1% | |
| 371 | 0% | 0.1% | |
| 372 | 0% | 0.1% | |
| 373 | 0% | 0.1% | |
| 374 | 0% | 0% | 
Labour Party – Scottish National Party – Plaid Cymru

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 278 | 0% | 100% | |
| 279 | 0% | 99.9% | |
| 280 | 0% | 99.9% | |
| 281 | 0% | 99.9% | |
| 282 | 0% | 99.9% | |
| 283 | 0.1% | 99.8% | |
| 284 | 0.1% | 99.8% | |
| 285 | 0.2% | 99.6% | |
| 286 | 0.1% | 99.5% | |
| 287 | 0.2% | 99.3% | |
| 288 | 0.2% | 99.1% | |
| 289 | 0.2% | 98.9% | |
| 290 | 0.3% | 98.7% | |
| 291 | 0.3% | 98% | |
| 292 | 0.3% | 98% | |
| 293 | 0.3% | 98% | |
| 294 | 0.9% | 98% | |
| 295 | 0.6% | 97% | |
| 296 | 0.9% | 96% | |
| 297 | 2% | 95% | |
| 298 | 1.2% | 93% | |
| 299 | 2% | 92% | |
| 300 | 0.7% | 90% | |
| 301 | 0.9% | 89% | Last Result | 
| 302 | 0.6% | 88% | |
| 303 | 2% | 88% | |
| 304 | 1.1% | 86% | |
| 305 | 1.2% | 84% | |
| 306 | 0.3% | 83% | |
| 307 | 3% | 83% | |
| 308 | 1.4% | 80% | |
| 309 | 2% | 78% | |
| 310 | 0.7% | 77% | |
| 311 | 2% | 76% | |
| 312 | 0.7% | 74% | |
| 313 | 1.5% | 73% | |
| 314 | 2% | 71% | |
| 315 | 3% | 70% | |
| 316 | 4% | 67% | |
| 317 | 0.7% | 63% | |
| 318 | 2% | 62% | |
| 319 | 3% | 60% | |
| 320 | 1.2% | 57% | |
| 321 | 3% | 56% | |
| 322 | 4% | 53% | |
| 323 | 0.7% | 49% | |
| 324 | 2% | 49% | Median | 
| 325 | 3% | 47% | |
| 326 | 2% | 44% | Majority | 
| 327 | 0.8% | 42% | |
| 328 | 0.6% | 41% | |
| 329 | 2% | 41% | |
| 330 | 3% | 39% | |
| 331 | 3% | 36% | |
| 332 | 1.4% | 33% | |
| 333 | 2% | 31% | |
| 334 | 2% | 29% | |
| 335 | 2% | 28% | |
| 336 | 1.2% | 26% | |
| 337 | 2% | 25% | |
| 338 | 2% | 23% | |
| 339 | 2% | 21% | |
| 340 | 0.9% | 19% | |
| 341 | 0.6% | 18% | |
| 342 | 3% | 18% | |
| 343 | 2% | 15% | |
| 344 | 2% | 13% | |
| 345 | 0.8% | 11% | |
| 346 | 2% | 10% | |
| 347 | 1.1% | 9% | |
| 348 | 0.6% | 7% | |
| 349 | 0.7% | 7% | |
| 350 | 1.4% | 6% | |
| 351 | 0.7% | 5% | |
| 352 | 1.0% | 4% | |
| 353 | 0.7% | 3% | |
| 354 | 0.8% | 2% | |
| 355 | 0.4% | 2% | |
| 356 | 0.4% | 1.2% | |
| 357 | 0.4% | 0.9% | |
| 358 | 0.1% | 0.5% | |
| 359 | 0.1% | 0.4% | |
| 360 | 0.1% | 0.3% | |
| 361 | 0.1% | 0.2% | |
| 362 | 0% | 0.1% | |
| 363 | 0% | 0.1% | |
| 364 | 0% | 0.1% | |
| 365 | 0% | 0.1% | |
| 366 | 0% | 0% | 
Labour Party – Scottish National Party

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 272 | 0% | 100% | |
| 273 | 0% | 99.9% | |
| 274 | 0% | 99.9% | |
| 275 | 0% | 99.9% | |
| 276 | 0% | 99.9% | |
| 277 | 0.1% | 99.8% | |
| 278 | 0.1% | 99.8% | |
| 279 | 0.1% | 99.7% | |
| 280 | 0.2% | 99.6% | |
| 281 | 0.2% | 99.4% | |
| 282 | 0.2% | 99.2% | |
| 283 | 0.2% | 99.0% | |
| 284 | 0.2% | 98.8% | |
| 285 | 0.4% | 98.6% | |
| 286 | 0.3% | 98% | |
| 287 | 0.4% | 98% | |
| 288 | 0.4% | 98% | |
| 289 | 1.0% | 97% | |
| 290 | 0.6% | 96% | |
| 291 | 0.8% | 96% | |
| 292 | 2% | 95% | |
| 293 | 1.2% | 93% | |
| 294 | 2% | 92% | |
| 295 | 0.6% | 90% | |
| 296 | 1.0% | 89% | |
| 297 | 0.7% | 88% | Last Result | 
| 298 | 2% | 88% | |
| 299 | 1.4% | 85% | |
| 300 | 1.1% | 84% | |
| 301 | 0.4% | 83% | |
| 302 | 3% | 83% | |
| 303 | 1.5% | 80% | |
| 304 | 2% | 78% | |
| 305 | 0.8% | 77% | |
| 306 | 2% | 76% | |
| 307 | 0.8% | 73% | |
| 308 | 1.4% | 73% | |
| 309 | 2% | 71% | |
| 310 | 2% | 69% | |
| 311 | 4% | 67% | |
| 312 | 0.6% | 63% | |
| 313 | 2% | 62% | |
| 314 | 3% | 60% | |
| 315 | 1.2% | 57% | |
| 316 | 3% | 56% | |
| 317 | 4% | 53% | |
| 318 | 0.9% | 49% | |
| 319 | 2% | 48% | Median | 
| 320 | 3% | 47% | |
| 321 | 2% | 44% | |
| 322 | 0.9% | 42% | |
| 323 | 0.7% | 41% | |
| 324 | 2% | 40% | |
| 325 | 3% | 39% | |
| 326 | 3% | 36% | Majority | 
| 327 | 2% | 33% | |
| 328 | 2% | 31% | |
| 329 | 2% | 29% | |
| 330 | 2% | 28% | |
| 331 | 1.0% | 26% | |
| 332 | 2% | 25% | |
| 333 | 1.4% | 23% | |
| 334 | 2% | 21% | |
| 335 | 1.0% | 19% | |
| 336 | 0.6% | 18% | |
| 337 | 2% | 17% | |
| 338 | 2% | 15% | |
| 339 | 2% | 13% | |
| 340 | 0.8% | 11% | |
| 341 | 2% | 10% | |
| 342 | 0.9% | 8% | |
| 343 | 0.7% | 7% | |
| 344 | 0.6% | 7% | |
| 345 | 1.4% | 6% | |
| 346 | 0.6% | 5% | |
| 347 | 0.9% | 4% | |
| 348 | 0.8% | 3% | |
| 349 | 0.6% | 2% | |
| 350 | 0.5% | 2% | |
| 351 | 0.3% | 1.3% | |
| 352 | 0.4% | 0.9% | |
| 353 | 0.1% | 0.6% | |
| 354 | 0.1% | 0.4% | |
| 355 | 0.1% | 0.4% | |
| 356 | 0.1% | 0.2% | |
| 357 | 0% | 0.2% | |
| 358 | 0% | 0.1% | |
| 359 | 0% | 0.1% | |
| 360 | 0% | 0.1% | |
| 361 | 0% | 0% | 
Conservative Party – Liberal Democrats

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 265 | 0% | 100% | |
| 266 | 0% | 99.9% | |
| 267 | 0% | 99.9% | |
| 268 | 0% | 99.9% | |
| 269 | 0.1% | 99.9% | |
| 270 | 0.1% | 99.8% | |
| 271 | 0.1% | 99.7% | |
| 272 | 0.1% | 99.6% | |
| 273 | 0.4% | 99.5% | |
| 274 | 0.4% | 99.1% | |
| 275 | 0.4% | 98.8% | |
| 276 | 0.8% | 98% | |
| 277 | 0.7% | 98% | |
| 278 | 1.0% | 97% | |
| 279 | 0.7% | 96% | |
| 280 | 1.4% | 95% | |
| 281 | 0.7% | 94% | |
| 282 | 0.6% | 93% | |
| 283 | 1.1% | 93% | |
| 284 | 2% | 91% | |
| 285 | 0.8% | 90% | |
| 286 | 2% | 89% | |
| 287 | 2% | 87% | |
| 288 | 3% | 85% | |
| 289 | 0.6% | 82% | |
| 290 | 0.9% | 82% | |
| 291 | 2% | 81% | |
| 292 | 2% | 79% | |
| 293 | 2% | 77% | |
| 294 | 1.2% | 75% | |
| 295 | 2% | 74% | |
| 296 | 2% | 72% | |
| 297 | 2% | 71% | |
| 298 | 1.4% | 69% | |
| 299 | 3% | 67% | |
| 300 | 3% | 64% | |
| 301 | 2% | 61% | |
| 302 | 0.6% | 59% | |
| 303 | 0.8% | 59% | |
| 304 | 2% | 58% | |
| 305 | 3% | 56% | |
| 306 | 2% | 53% | |
| 307 | 0.7% | 51% | |
| 308 | 4% | 51% | Median | 
| 309 | 3% | 47% | |
| 310 | 1.2% | 44% | |
| 311 | 3% | 43% | |
| 312 | 2% | 40% | |
| 313 | 0.7% | 38% | |
| 314 | 4% | 37% | |
| 315 | 3% | 33% | |
| 316 | 2% | 30% | |
| 317 | 1.5% | 29% | |
| 318 | 0.7% | 27% | |
| 319 | 2% | 26% | |
| 320 | 0.7% | 24% | |
| 321 | 2% | 23% | |
| 322 | 1.4% | 22% | |
| 323 | 3% | 20% | |
| 324 | 0.3% | 17% | |
| 325 | 1.2% | 17% | |
| 326 | 1.1% | 16% | Majority | 
| 327 | 2% | 14% | |
| 328 | 0.6% | 12% | |
| 329 | 0.9% | 12% | Last Result | 
| 330 | 0.7% | 11% | |
| 331 | 2% | 10% | |
| 332 | 1.2% | 8% | |
| 333 | 2% | 7% | |
| 334 | 0.9% | 5% | |
| 335 | 0.6% | 4% | |
| 336 | 0.9% | 3% | |
| 337 | 0.3% | 2% | |
| 338 | 0.3% | 2% | |
| 339 | 0.3% | 2% | |
| 340 | 0.3% | 2% | |
| 341 | 0.2% | 1.3% | |
| 342 | 0.2% | 1.1% | |
| 343 | 0.2% | 0.9% | |
| 344 | 0.1% | 0.7% | |
| 345 | 0.2% | 0.5% | |
| 346 | 0.1% | 0.4% | |
| 347 | 0.1% | 0.2% | |
| 348 | 0% | 0.2% | |
| 349 | 0% | 0.1% | |
| 350 | 0% | 0.1% | |
| 351 | 0% | 0.1% | |
| 352 | 0% | 0.1% | |
| 353 | 0% | 0% | 
Conservative Party – Plaid Cymru

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 257 | 0% | 100% | |
| 258 | 0% | 99.9% | |
| 259 | 0% | 99.9% | |
| 260 | 0% | 99.9% | |
| 261 | 0% | 99.9% | |
| 262 | 0.1% | 99.8% | |
| 263 | 0.1% | 99.7% | |
| 264 | 0.1% | 99.6% | |
| 265 | 0.1% | 99.5% | |
| 266 | 0.3% | 99.4% | |
| 267 | 0.4% | 99.1% | |
| 268 | 0.5% | 98.7% | |
| 269 | 0.5% | 98% | |
| 270 | 0.6% | 98% | |
| 271 | 0.8% | 97% | |
| 272 | 0.7% | 96% | |
| 273 | 0.5% | 95% | |
| 274 | 1.0% | 95% | |
| 275 | 0.9% | 94% | |
| 276 | 0.9% | 93% | |
| 277 | 1.4% | 92% | |
| 278 | 1.0% | 91% | |
| 279 | 2% | 90% | |
| 280 | 1.1% | 88% | |
| 281 | 2% | 87% | |
| 282 | 2% | 86% | |
| 283 | 1.5% | 83% | |
| 284 | 2% | 82% | |
| 285 | 1.5% | 80% | |
| 286 | 2% | 78% | |
| 287 | 1.1% | 76% | |
| 288 | 2% | 75% | |
| 289 | 2% | 74% | |
| 290 | 1.3% | 72% | |
| 291 | 2% | 71% | |
| 292 | 2% | 68% | |
| 293 | 2% | 66% | |
| 294 | 1.3% | 65% | |
| 295 | 3% | 63% | |
| 296 | 2% | 60% | |
| 297 | 0.8% | 58% | |
| 298 | 2% | 58% | |
| 299 | 2% | 56% | |
| 300 | 2% | 54% | |
| 301 | 1.3% | 52% | |
| 302 | 4% | 51% | Median | 
| 303 | 0.7% | 46% | |
| 304 | 1.2% | 46% | |
| 305 | 3% | 45% | |
| 306 | 3% | 42% | |
| 307 | 1.0% | 39% | |
| 308 | 4% | 38% | |
| 309 | 2% | 34% | |
| 310 | 2% | 32% | |
| 311 | 2% | 30% | |
| 312 | 2% | 28% | |
| 313 | 2% | 27% | |
| 314 | 0.6% | 24% | |
| 315 | 1.0% | 24% | |
| 316 | 1.4% | 23% | |
| 317 | 2% | 21% | |
| 318 | 0.9% | 20% | |
| 319 | 2% | 19% | |
| 320 | 1.1% | 17% | |
| 321 | 0.6% | 16% | Last Result | 
| 322 | 1.0% | 15% | |
| 323 | 2% | 14% | |
| 324 | 0.9% | 12% | |
| 325 | 1.1% | 11% | |
| 326 | 2% | 10% | Majority | 
| 327 | 0.9% | 8% | |
| 328 | 1.2% | 7% | |
| 329 | 0.8% | 6% | |
| 330 | 1.2% | 5% | |
| 331 | 0.3% | 4% | |
| 332 | 0.5% | 4% | |
| 333 | 0.5% | 3% | |
| 334 | 0.6% | 3% | |
| 335 | 0.3% | 2% | |
| 336 | 0.2% | 2% | |
| 337 | 0.3% | 1.4% | |
| 338 | 0.2% | 1.0% | |
| 339 | 0.2% | 0.9% | |
| 340 | 0.2% | 0.6% | |
| 341 | 0.1% | 0.4% | |
| 342 | 0.1% | 0.3% | |
| 343 | 0.1% | 0.3% | |
| 344 | 0% | 0.2% | |
| 345 | 0% | 0.1% | |
| 346 | 0% | 0.1% | |
| 347 | 0% | 0.1% | |
| 348 | 0% | 0.1% | |
| 349 | 0% | 0% | 
Conservative Party

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 252 | 0% | 100% | |
| 253 | 0% | 99.9% | |
| 254 | 0% | 99.9% | |
| 255 | 0% | 99.9% | |
| 256 | 0% | 99.9% | |
| 257 | 0.1% | 99.8% | |
| 258 | 0.1% | 99.8% | |
| 259 | 0.1% | 99.6% | |
| 260 | 0.1% | 99.5% | |
| 261 | 0.2% | 99.4% | |
| 262 | 0.5% | 99.2% | |
| 263 | 0.4% | 98.7% | |
| 264 | 0.6% | 98% | |
| 265 | 0.7% | 98% | |
| 266 | 0.8% | 97% | |
| 267 | 0.8% | 96% | |
| 268 | 0.5% | 95% | |
| 269 | 0.9% | 95% | |
| 270 | 1.0% | 94% | |
| 271 | 1.1% | 93% | |
| 272 | 1.1% | 92% | |
| 273 | 1.0% | 91% | |
| 274 | 1.4% | 90% | |
| 275 | 1.4% | 88% | |
| 276 | 2% | 87% | |
| 277 | 2% | 85% | |
| 278 | 1.5% | 83% | |
| 279 | 2% | 82% | |
| 280 | 1.4% | 80% | |
| 281 | 2% | 78% | |
| 282 | 1.3% | 77% | |
| 283 | 2% | 75% | |
| 284 | 2% | 73% | |
| 285 | 1.4% | 72% | |
| 286 | 2% | 70% | |
| 287 | 2% | 69% | |
| 288 | 2% | 66% | |
| 289 | 1.3% | 65% | |
| 290 | 3% | 63% | |
| 291 | 2% | 60% | |
| 292 | 0.7% | 58% | |
| 293 | 2% | 57% | |
| 294 | 2% | 56% | |
| 295 | 2% | 54% | |
| 296 | 1.1% | 52% | |
| 297 | 4% | 51% | Median | 
| 298 | 0.7% | 46% | |
| 299 | 1.0% | 45% | |
| 300 | 3% | 44% | |
| 301 | 3% | 41% | |
| 302 | 1.0% | 39% | |
| 303 | 4% | 38% | |
| 304 | 2% | 33% | |
| 305 | 2% | 32% | |
| 306 | 2% | 30% | |
| 307 | 1.5% | 28% | |
| 308 | 3% | 27% | |
| 309 | 0.6% | 24% | |
| 310 | 0.9% | 24% | |
| 311 | 1.2% | 23% | |
| 312 | 2% | 21% | |
| 313 | 0.9% | 19% | |
| 314 | 2% | 19% | |
| 315 | 1.1% | 17% | |
| 316 | 0.7% | 16% | |
| 317 | 0.9% | 15% | Last Result | 
| 318 | 3% | 14% | |
| 319 | 0.9% | 12% | |
| 320 | 1.2% | 11% | |
| 321 | 2% | 10% | |
| 322 | 0.9% | 8% | |
| 323 | 1.1% | 7% | |
| 324 | 0.9% | 6% | |
| 325 | 1.3% | 5% | |
| 326 | 0.3% | 4% | Majority | 
| 327 | 0.4% | 3% | |
| 328 | 0.4% | 3% | |
| 329 | 0.7% | 2% | |
| 330 | 0.4% | 2% | |
| 331 | 0.2% | 1.4% | |
| 332 | 0.3% | 1.2% | |
| 333 | 0.1% | 0.9% | |
| 334 | 0.2% | 0.8% | |
| 335 | 0.2% | 0.6% | |
| 336 | 0.1% | 0.4% | |
| 337 | 0% | 0.3% | |
| 338 | 0.1% | 0.2% | |
| 339 | 0% | 0.2% | |
| 340 | 0% | 0.1% | |
| 341 | 0% | 0.1% | |
| 342 | 0% | 0.1% | |
| 343 | 0% | 0% | 
Labour Party – Liberal Democrats – Plaid Cymru

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 237 | 0% | 100% | |
| 238 | 0% | 99.9% | |
| 239 | 0% | 99.9% | |
| 240 | 0.1% | 99.9% | |
| 241 | 0% | 99.8% | |
| 242 | 0% | 99.8% | |
| 243 | 0.2% | 99.7% | |
| 244 | 0.1% | 99.6% | |
| 245 | 0.1% | 99.5% | |
| 246 | 0.2% | 99.4% | |
| 247 | 0.5% | 99.2% | |
| 248 | 0.4% | 98.7% | |
| 249 | 1.0% | 98% | |
| 250 | 0.4% | 97% | |
| 251 | 0.5% | 97% | |
| 252 | 0.5% | 97% | |
| 253 | 1.2% | 96% | |
| 254 | 0.9% | 95% | |
| 255 | 2% | 94% | |
| 256 | 0.9% | 92% | |
| 257 | 1.3% | 91% | |
| 258 | 2% | 90% | |
| 259 | 1.0% | 88% | |
| 260 | 0.9% | 87% | |
| 261 | 0.8% | 86% | |
| 262 | 1.2% | 85% | |
| 263 | 1.1% | 84% | |
| 264 | 2% | 83% | |
| 265 | 1.2% | 81% | |
| 266 | 0.9% | 80% | |
| 267 | 3% | 79% | |
| 268 | 1.5% | 76% | |
| 269 | 0.7% | 75% | |
| 270 | 2% | 74% | |
| 271 | 2% | 73% | |
| 272 | 4% | 71% | |
| 273 | 2% | 67% | |
| 274 | 0.7% | 65% | |
| 275 | 3% | 64% | |
| 276 | 3% | 62% | |
| 277 | 1.0% | 59% | |
| 278 | 2% | 58% | Last Result | 
| 279 | 2% | 55% | |
| 280 | 1.3% | 54% | |
| 281 | 3% | 52% | Median | 
| 282 | 3% | 50% | |
| 283 | 0.6% | 47% | |
| 284 | 2% | 46% | |
| 285 | 4% | 45% | |
| 286 | 1.5% | 41% | |
| 287 | 2% | 39% | |
| 288 | 2% | 38% | |
| 289 | 1.2% | 35% | |
| 290 | 2% | 34% | |
| 291 | 2% | 32% | |
| 292 | 1.0% | 30% | |
| 293 | 2% | 29% | |
| 294 | 2% | 27% | |
| 295 | 3% | 25% | |
| 296 | 1.1% | 22% | |
| 297 | 2% | 21% | |
| 298 | 0.7% | 20% | |
| 299 | 3% | 19% | |
| 300 | 2% | 16% | |
| 301 | 2% | 14% | |
| 302 | 1.2% | 13% | |
| 303 | 0.8% | 11% | |
| 304 | 1.2% | 11% | |
| 305 | 2% | 9% | |
| 306 | 0.9% | 8% | |
| 307 | 0.8% | 7% | |
| 308 | 0.6% | 6% | |
| 309 | 1.0% | 5% | |
| 310 | 1.2% | 4% | |
| 311 | 0.7% | 3% | |
| 312 | 0.4% | 3% | |
| 313 | 0.6% | 2% | |
| 314 | 0.3% | 2% | |
| 315 | 0.3% | 1.2% | |
| 316 | 0.2% | 1.0% | |
| 317 | 0.2% | 0.7% | |
| 318 | 0.2% | 0.6% | |
| 319 | 0.1% | 0.4% | |
| 320 | 0.1% | 0.3% | |
| 321 | 0.1% | 0.2% | |
| 322 | 0% | 0.2% | |
| 323 | 0% | 0.2% | |
| 324 | 0% | 0.1% | |
| 325 | 0% | 0.1% | |
| 326 | 0% | 0.1% | Majority | 
| 327 | 0% | 0% | 
Labour Party – Liberal Democrats

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 231 | 0% | 100% | |
| 232 | 0% | 99.9% | |
| 233 | 0% | 99.9% | |
| 234 | 0% | 99.9% | |
| 235 | 0.1% | 99.9% | |
| 236 | 0% | 99.8% | |
| 237 | 0.1% | 99.7% | |
| 238 | 0.2% | 99.7% | |
| 239 | 0.1% | 99.5% | |
| 240 | 0.1% | 99.4% | |
| 241 | 0.2% | 99.3% | |
| 242 | 0.5% | 99.0% | |
| 243 | 0.4% | 98.5% | |
| 244 | 0.8% | 98% | |
| 245 | 0.4% | 97% | |
| 246 | 0.5% | 97% | |
| 247 | 0.5% | 96% | |
| 248 | 1.3% | 96% | |
| 249 | 0.8% | 94% | |
| 250 | 2% | 94% | |
| 251 | 1.0% | 92% | |
| 252 | 1.2% | 91% | |
| 253 | 2% | 90% | |
| 254 | 1.0% | 88% | |
| 255 | 0.9% | 87% | |
| 256 | 0.9% | 86% | |
| 257 | 1.3% | 85% | |
| 258 | 1.1% | 84% | |
| 259 | 2% | 83% | |
| 260 | 1.1% | 81% | |
| 261 | 0.8% | 80% | |
| 262 | 3% | 79% | |
| 263 | 2% | 76% | |
| 264 | 0.8% | 75% | |
| 265 | 2% | 74% | |
| 266 | 2% | 72% | |
| 267 | 4% | 70% | |
| 268 | 2% | 67% | |
| 269 | 0.7% | 65% | |
| 270 | 3% | 64% | |
| 271 | 3% | 62% | |
| 272 | 0.8% | 58% | |
| 273 | 2% | 57% | |
| 274 | 2% | 55% | Last Result | 
| 275 | 1.5% | 54% | |
| 276 | 3% | 52% | Median | 
| 277 | 3% | 49% | |
| 278 | 0.7% | 47% | |
| 279 | 1.3% | 46% | |
| 280 | 4% | 45% | |
| 281 | 1.4% | 41% | |
| 282 | 2% | 39% | |
| 283 | 2% | 38% | |
| 284 | 2% | 36% | |
| 285 | 2% | 34% | |
| 286 | 2% | 32% | |
| 287 | 1.0% | 30% | |
| 288 | 1.5% | 29% | |
| 289 | 2% | 27% | |
| 290 | 3% | 25% | |
| 291 | 1.0% | 22% | |
| 292 | 2% | 21% | |
| 293 | 0.7% | 20% | |
| 294 | 3% | 19% | |
| 295 | 1.4% | 16% | |
| 296 | 2% | 14% | |
| 297 | 1.1% | 12% | |
| 298 | 0.9% | 11% | |
| 299 | 1.2% | 11% | |
| 300 | 2% | 9% | |
| 301 | 0.8% | 8% | |
| 302 | 0.8% | 7% | |
| 303 | 0.5% | 6% | |
| 304 | 1.0% | 5% | |
| 305 | 1.3% | 4% | |
| 306 | 0.6% | 3% | |
| 307 | 0.5% | 3% | |
| 308 | 0.6% | 2% | |
| 309 | 0.3% | 2% | |
| 310 | 0.3% | 1.3% | |
| 311 | 0.3% | 1.0% | |
| 312 | 0.1% | 0.7% | |
| 313 | 0.2% | 0.6% | |
| 314 | 0.1% | 0.4% | |
| 315 | 0.1% | 0.3% | |
| 316 | 0.1% | 0.3% | |
| 317 | 0% | 0.2% | |
| 318 | 0% | 0.2% | |
| 319 | 0% | 0.1% | |
| 320 | 0% | 0.1% | |
| 321 | 0% | 0.1% | |
| 322 | 0% | 0.1% | |
| 323 | 0% | 0% | 
Labour Party – Plaid Cymru

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 231 | 0.1% | 100% | |
| 232 | 0.1% | 99.9% | |
| 233 | 0.1% | 99.9% | |
| 234 | 0% | 99.8% | |
| 235 | 0.1% | 99.8% | |
| 236 | 0.2% | 99.7% | |
| 237 | 0.1% | 99.5% | |
| 238 | 0.1% | 99.4% | |
| 239 | 0.1% | 99.2% | |
| 240 | 0% | 99.1% | |
| 241 | 0.3% | 99.1% | |
| 242 | 2% | 98.7% | |
| 243 | 1.4% | 97% | |
| 244 | 2% | 96% | |
| 245 | 3% | 94% | |
| 246 | 0.3% | 91% | |
| 247 | 0.1% | 91% | |
| 248 | 0.9% | 91% | |
| 249 | 2% | 90% | |
| 250 | 0.8% | 88% | |
| 251 | 0.8% | 87% | |
| 252 | 0.8% | 86% | |
| 253 | 4% | 86% | |
| 254 | 0.4% | 81% | |
| 255 | 1.4% | 81% | |
| 256 | 3% | 80% | |
| 257 | 0.4% | 77% | |
| 258 | 0.1% | 76% | |
| 259 | 0.4% | 76% | |
| 260 | 2% | 76% | |
| 261 | 6% | 73% | |
| 262 | 1.2% | 68% | |
| 263 | 0.4% | 67% | |
| 264 | 3% | 66% | |
| 265 | 2% | 63% | |
| 266 | 1.1% | 61% | Last Result | 
| 267 | 7% | 60% | |
| 268 | 0.6% | 54% | |
| 269 | 0.9% | 53% | |
| 270 | 3% | 52% | Median | 
| 271 | 3% | 49% | |
| 272 | 0.3% | 46% | |
| 273 | 0.2% | 46% | |
| 274 | 0.6% | 46% | |
| 275 | 2% | 45% | |
| 276 | 7% | 43% | |
| 277 | 2% | 36% | |
| 278 | 1.4% | 34% | |
| 279 | 1.4% | 32% | |
| 280 | 0.8% | 31% | |
| 281 | 2% | 30% | |
| 282 | 2% | 28% | |
| 283 | 0.9% | 26% | |
| 284 | 3% | 25% | |
| 285 | 1.4% | 22% | |
| 286 | 0.7% | 21% | |
| 287 | 0.7% | 20% | |
| 288 | 4% | 19% | |
| 289 | 2% | 16% | |
| 290 | 3% | 14% | |
| 291 | 1.1% | 11% | |
| 292 | 0.7% | 10% | |
| 293 | 0.3% | 9% | |
| 294 | 0.9% | 9% | |
| 295 | 2% | 8% | |
| 296 | 0.7% | 6% | |
| 297 | 0.9% | 5% | |
| 298 | 1.1% | 4% | |
| 299 | 1.0% | 3% | |
| 300 | 0.4% | 2% | |
| 301 | 0.2% | 1.4% | |
| 302 | 0.5% | 1.3% | |
| 303 | 0.2% | 0.7% | |
| 304 | 0.1% | 0.5% | |
| 305 | 0% | 0.5% | |
| 306 | 0.1% | 0.4% | |
| 307 | 0.1% | 0.3% | |
| 308 | 0.1% | 0.2% | |
| 309 | 0% | 0.1% | |
| 310 | 0% | 0.1% | |
| 311 | 0% | 0.1% | |
| 312 | 0% | 0.1% | |
| 313 | 0% | 0% | 
Labour Party

| Number of Seats | Probability | Accumulated | Special Marks | 
|---|---|---|---|
| 225 | 0% | 100% | |
| 226 | 0.1% | 99.9% | |
| 227 | 0.1% | 99.9% | |
| 228 | 0.1% | 99.8% | |
| 229 | 0.1% | 99.8% | |
| 230 | 0.1% | 99.7% | |
| 231 | 0.2% | 99.6% | |
| 232 | 0.1% | 99.4% | |
| 233 | 0.1% | 99.3% | |
| 234 | 0.2% | 99.2% | |
| 235 | 0.2% | 99.0% | |
| 236 | 0.5% | 98.8% | |
| 237 | 2% | 98% | |
| 238 | 1.4% | 97% | |
| 239 | 2% | 95% | |
| 240 | 2% | 94% | |
| 241 | 0.5% | 91% | |
| 242 | 0.2% | 91% | |
| 243 | 0.8% | 91% | |
| 244 | 2% | 90% | |
| 245 | 1.0% | 88% | |
| 246 | 0.8% | 87% | |
| 247 | 0.8% | 86% | |
| 248 | 4% | 85% | |
| 249 | 0.4% | 81% | |
| 250 | 1.3% | 81% | |
| 251 | 3% | 80% | |
| 252 | 0.8% | 77% | |
| 253 | 0.3% | 76% | |
| 254 | 0.5% | 76% | |
| 255 | 2% | 75% | |
| 256 | 5% | 73% | |
| 257 | 2% | 68% | |
| 258 | 0.5% | 66% | |
| 259 | 3% | 66% | |
| 260 | 2% | 63% | |
| 261 | 1.1% | 61% | |
| 262 | 6% | 60% | Last Result | 
| 263 | 0.9% | 54% | |
| 264 | 0.9% | 53% | |
| 265 | 3% | 52% | Median | 
| 266 | 3% | 49% | |
| 267 | 0.4% | 46% | |
| 268 | 0.3% | 46% | |
| 269 | 0.7% | 45% | |
| 270 | 2% | 45% | |
| 271 | 7% | 43% | |
| 272 | 2% | 36% | |
| 273 | 2% | 34% | |
| 274 | 1.3% | 32% | |
| 275 | 0.8% | 31% | |
| 276 | 2% | 30% | |
| 277 | 2% | 28% | |
| 278 | 0.9% | 26% | |
| 279 | 3% | 25% | |
| 280 | 2% | 22% | |
| 281 | 0.8% | 21% | |
| 282 | 0.6% | 20% | |
| 283 | 4% | 19% | |
| 284 | 2% | 16% | |
| 285 | 2% | 14% | |
| 286 | 1.3% | 11% | |
| 287 | 0.8% | 10% | |
| 288 | 0.4% | 9% | |
| 289 | 0.8% | 9% | |
| 290 | 2% | 8% | |
| 291 | 0.8% | 6% | |
| 292 | 0.8% | 5% | |
| 293 | 1.2% | 4% | |
| 294 | 0.9% | 3% | |
| 295 | 0.5% | 2% | |
| 296 | 0.2% | 1.5% | |
| 297 | 0.5% | 1.3% | |
| 298 | 0.3% | 0.8% | |
| 299 | 0.1% | 0.5% | |
| 300 | 0% | 0.5% | |
| 301 | 0.1% | 0.4% | |
| 302 | 0.1% | 0.3% | |
| 303 | 0.1% | 0.2% | |
| 304 | 0% | 0.1% | |
| 305 | 0% | 0.1% | |
| 306 | 0% | 0.1% | |
| 307 | 0% | 0.1% | |
| 308 | 0% | 0% | 
Technical Information
Opinion Poll
- Polling firm: Opinium
 - Commissioner(s): The Observer
 - Fieldwork period: 11–13 September 2018
 
Calculations
- Sample size: 2011
 - Simulations done: 1,048,576
 - Error estimate: 1.08%