Local council · Blackburn with Darwen
Blackburn South East
1 seat contested on Thursday 7 May 2026. 4 candidates from 4 parties.
Neighbours shaded by Reform UK share vs this ward, red = higher, blue = lower.
Predicted vote share
What the model expects
Predictions are point estimates: the model's best guess, not a guarantee. The "How this prediction was made" section below lists every step that shaped this forecast.
How accurate was the model here?
Our 7 May 2026 forecast for Blackburn South East
| Party | Predicted | Actual | Gap |
|---|---|---|---|
| Reform UK | 43.0% | 46.6% | -3.6pp |
| Labour | 37.1% | 27.0% | +10.1pp |
| Conservative | 16.4% | 7.2% | +9.2pp |
Positive gap = we predicted that party would win more share than they did. See the full Blackburn with Darwen accuracy summary or the national audit.
Recent contests
What happened last time
| Date | Type | Winner | Top share | Source |
|---|---|---|---|---|
| 2024-05-02 | Cycle | Labour Party | 58.3% | declaration |
| 2023-05-04 | Cycle | Labour and Co-operative Party | 73.4% | declaration |
| 2022-05-05 | Cycle | Labour Party | 73.1% | declaration |
| 2021-05-06 | Cycle | Labour Party | 59.0% | declaration |
| 2019-05-02 | Cycle | Labour Party | 57.3% | declaration |
Candidates 2026
Parties on the ballot
- Conservative and Unionist Party
- Green Party
- Labour Party
- Reform UK
How this area looks demographically
Figures are for Blackburn with Darwen as a whole. The same local-authority figures are used for every ward in the council, finer ward-level demographics will land in a future release.
- White British (projected May 2026): 51.8% (Census 2021: 56.9%)
- Asian heritage (projected May 2026): 39.6% (Census 2021: 35.6%)
- Average area deprivation decile: 3.3 (1 = most deprived, 10 = least)
How this prediction was made
- Baseline . Most recent borough result (2024-05-02)
- BES MRP Prior . Baseline blended with BES Wave 1-30 north_west prior (weight 15%, n=3934 regional respondents)
- National Swing (STM) . Strong Transition Model: multiplicative bounded swing, dampened by 0.1 for local
- Demographics . 2 demographic factor(s) applied
- Incumbency . No current holder data available
- New Party Entry . Reform UK estimated at 4.8% from GE/LCC proxy + swing
- Normalise . All shares scaled to sum to 100%
- Restrict to ballot . Removed 5 party/parties not standing in 2026 (Independent 22.0pp, Liberal Democrats 1.7pp, SNP 0.1pp, Other 0.0pp, Plaid Cymru 0.0pp). Their share redistributed pro-rata.
- 2025 county-cycle anchor . No 2025 reference available for this council's parent area. Stage 1 uses national polling only.
- Reform realignment uplift (no-anchor councils) . No 2025 parent-county anchor available; demographic-borrow rule applied. Asian 39.6% → base target 20.2% × regional multiplier 1.00 = 20.2%. Reform 5.7% → 20.2% (lift +14.4pp). Other parties scaled pro-rata. Calibration source: Burnley 2026 ward-level Asian%↔Reform% relationship (the 2-tier district that did receive the LCC 2025 anchor).
- National-share calibration . Aggregate-predicted vs national-polled mismatch corrected at strength 0.65. Multipliers — Labour ×0.82, Conservative ×1.00, Reform UK ×1.15, Liberal Democrats ×0.96, Green Party ×1.12, SNP ×1.00, Plaid Cymru ×1.00.