Brentford and Isleworth
London · Borough constituency
About the Brentford and Isleworth constituency
Brentford and Isleworth is a borough constituency in London. The sitting MP is Ruth Cadbury (Labour), first elected in May 2015. At the 2024 general election, Labour won with 44.2% to 22.5% for the Conservatives, a majority of 9,824 votes on a 57.0% turnout. PollCheck's current projection, at the seven-poll average, has Labour on 38.3% and the Conservatives on 22.4%, a margin of 15.9 points.
Who lives in Brentford and Isleworth? Constituency demographics
From the 2021 Census and 2016 EU referendum estimates. Constituency-level data on 2024 boundaries.
How did Brentford and Isleworth vote in 2024 and how would it vote now?
2024 vote shares from the HoC Library. Current projection is at the 7-poll average.
2024 general election
Current projection
Map of Brentford and Isleworth
Switch between GE2024 ward winners (modelled estimates, ~4pp average error) and a demographic view from the 2021 Census. Hover any area for detail. How the map is built ›
Brentford and Isleworth within Hounslow and Richmond upon Thames
Brentford and Isleworth crosses council boundaries: Hounslow (91%), Richmond upon Thames (9%). The figures below are from the 7 May 2026 council elections where held, otherwise the most recent available ward result. About this layer ›
Council overlap
| Council | Share of seat | Projection |
|---|---|---|
| Hounslow | 91% | View projection › |
| Richmond upon Thames | 9% | View projection › |
Most recent council ward results
Latest council winner per ward - May 2026 results where the council voted, otherwise the most recent available result. How this table is sourced ›
| Ward | GE2024 winner | Latest council winner | Shift since GE2024 | Turnout |
|---|---|---|---|---|
| Brentford East | Labour 45.4%vs Conservative 16.3% | May 2026 Labour 44.3%vs Reform 21.1% | Labour share -1.1pp | 31.9% |
| Brentford West | Labour 44.0%vs Conservative 20.4% | May 2026 Green 33.5%vs Labour 28.3% | Labour→Green +19.6pp | 45.5% |
| Heston East | Labour 45.4%vs Conservative 22.7% | May 2026 Labour 35.9%vs Conservative 24.7% | Labour share -9.4pp | 37.5% |
| Hounslow Central | Labour 43.3%vs Conservative 23.2% | May 2026 Labour 40.2%vs Conservative 36.4% | Labour share -3.2pp | 39.6% |
| Hounslow East | Labour 43.4%vs Conservative 22.8% | May 2026 Labour 33.3%vs Conservative 26.1% | Labour share -10.1pp | 38.9% |
| Hounslow Heath | Labour 47.0%vs Conservative 23.0% | May 2026 Labour 38.7%vs Conservative 21.4% | Labour share -8.4pp | 39.5% |
| Hounslow South | Labour 46.9%vs Conservative 25.4% | May 2026 Labour 35.8%vs Lib Dem 20.0% | Labour share -11.1pp | 43.6% |
| Isleworth | Labour 47.9%vs Conservative 18.9% | May 2026 Labour 37.5%vs Lib Dem 28.5% | Labour share -10.5pp | 44.6% |
| Osterley & Spring Grove | Labour 45.7%vs Conservative 24.8% | May 2026 Labour 39.4%vs Conservative 26.1% | Labour share -6.3pp | 40.4% |
| Syon & Brentford Lock | Labour 43.8%vs Conservative 19.7% | May 2026 Labour 35.8%vs Others 24.2% | Labour share -8.0pp | 40.5% |
| Whitton | Labour 28.9%vs Conservative 27.7% | May 2026 Lib Dem 48.7%vs Reform 16.7% | Labour→Lib Dem +26.8pp | 50.0% |
Projection trajectory
PollCheck's projection for Brentford and Isleworth at each of the last 60 GB polls. Hover the chart for the underlying poll details.
Who has won Brentford and Isleworth at past general elections?
2024 and notional 2019 rows are on current boundaries; 2010-2017 rows are on the boundaries in force at the time. More on boundaries ›
| Year | Result | MP | Lab | Con | LD | Majority | Turnout |
|---|---|---|---|---|---|---|---|
| 2010 | Con gain from Lab | Mary Macleod | 33.6% | 37.2% | 23.7% | 1,958 | 64.4% |
| 2015 | Lab gain from Con | Ruth Cadbury | 43.8% | 42.9% | 4.0% | 465 | 67.8%+3.4 |
| 2017 | Lab hold | Ruth Cadbury | 57.4% | 37.6% | 5.0% | 12,182 | 72.4%+4.6 |
| 2019notional | Labour winner | Ruth Cadbury 2019 MP, pre-review boundary | 50.3% | 28.3% | 16.3% | 11,369 | 67.6%-4.8 |
| 2024 | Lab hold | Ruth Cadbury | 44.2% | 22.5% | 8.5% | 9,824 | 57.0%-10.6 |
Earlier years are on pre-2024 boundaries; comparable results on the new boundary will be added when sourced.
Constituencies most like Brentford and Isleworth
Five seats with similar demographic profiles to Brentford and Isleworth. Politics shown for context.
- ↓Owner-occupied46.7 / 49.9vs 61.9
- ↑Private rent32.2 / 28.3vs 20.2
- ↓Age 65+14.7 / 15.4vs 22.7
- ↓Owner-occupied46.7 / 44.3vs 61.9
- ↑Private rent32.2 / 35.8vs 20.2
- ↑Graduate44.9 / 45.7vs 33.7
- ↑Private rent32.2 / 34.9vs 20.2
- ↑Graduate44.9 / 45.2vs 33.7
- ↓Owner-occupied46.7 / 51.8vs 61.9
- ↓Owner-occupied46.7 / 48.2vs 61.9
- ↑Private rent32.2 / 31.6vs 20.2
- ↑Graduate44.9 / 47.1vs 33.7
- ↓Leave43.3 / 44.7vs 53.2
- ↓Age 65+14.7 / 14.6vs 22.7
- ↓Owner-occupied46.7 / 53.1vs 61.9
What would change this seat?
Move the sliders to set national vote shares. The per-seat projection updates live. Reset returns to the current 7-poll average.
Related
Sources
Every figure on this page is computed from the sources below. Read the full methodology ›
Show full source list
- 2024 general election results · UK Parliament Election Results portal and House of Commons Library briefing CBP-10009.
- Notional 2019 results on 2024 boundaries · UK Parliament Election Results portal. Recalculated by Parliament; carries assumptions about how 2019 voters would have distributed across the redrawn boundaries.
- Historic general election results (2010-2017) · House of Commons Library historic results files (on the boundaries in force at the time).
- Ward-level GE2024 estimates · Britain Elects / New Statesman - article by Ben Walker, underlying spreadsheet. Modelled from constituency totals; average ~4pp per-ward MoE.
- May 2026 council ward results · Democracy Club via PollCheck's locals 2026 dataset.
- Earlier council ward results (2014-2024) · DCLEAPIL v1.0 (Jason Leman, drawing on Andrew Teale's LEAP dataset and Democracy Club).
- Demographics · ONS Census 2021 (England and Wales), aggregated to constituency level using the ONS LSOA21 -> PCON24 best-fit lookup.
- EU referendum 2016 estimates · Constituency-level Leave vote estimates (Hanretty 2017 method).
- MP details and Cabinet roles · UK Parliament Members API. MP photos are fetched live from the same source.
- Boundary geometry and lookups · ONS Open Geography Portal (PCON24 boundaries, LSOA21 boundaries, LSOA21-WD24-LAD24 best-fit lookup).
- Current projection and trajectory · PollCheck's demographic swingometer applied to the rolling 7-poll average from aggregated GB polls. Not a true MRP - vote-share movements are applied through per-constituency sensitivity multipliers derived from demographic regressions.
If you spot a data issue, please let us know.