Brentford and Isleworth
London · Borough constituency
About the Brentford and Isleworth constituency
Brentford and Isleworth is a borough constituency in London, spanning parts of Hounslow, Richmond upon Thames and neighbouring councils. The sitting MP is Ruth Cadbury (Labour), first elected in May 2015.
At the 2024 general election, Labour won Brentford and Isleworth with 44.2% of the vote, ahead of the Conservatives on 22.5%, a majority of 9,824 votes. Turnout was 57.0%.
If a general election were held today, PollCheck's projection at the current seven-poll average has Labour on 34.6% and the Conservatives on 22.5% in Brentford and Isleworth, a margin of 12.1 points. The projection updates automatically as new polls are added.
Demographically, Brentford and Isleworth is a Remain-leaning area (an estimated 43.3% voted Leave in 2016). About 44.9% of residents hold a degree, 46.7% of homes are owner-occupied, and the seat has a median age of about 37 (2021 Census).
Across the last 5 general elections on record, the seat has been won by Labour 4 times, the Conservatives 1 time (earlier years may be on predecessor boundaries).
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 ward-level 2024 election winners and a demographic view. Ward winners are Britain Elects' / New Statesman modelled estimates with an average ~4pp margin of error per ward. The demographic view splits the seat into small neighbourhoods (around 1,500 residents each, from the 2021 Census). Hover any area for detail.
Brentford and Isleworth within Hounslow and Richmond upon Thames
Brentford and Isleworth crosses multiple council boundaries: Hounslow (91%), Richmond upon Thames (9%). The figures below come from the council elections held on Thursday 7 May 2026 in each constituent council where they were held; for councils not in the 2026 election cycle the most recent available ward result is shown instead.
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. Where the council held a May 2026 election, those results are shown; otherwise we show the most recent available ward result (via DCLEAPIL, 2014-2024), or, where the seat was uncontested at the last election, the current sitting councillor from OpenCouncilData. The "Shift since GE2024" column is only computed for May 2026 results - earlier council votes pre-date the GE, so no directional shift is shown.
| Ward | GE2024 winner | Latest council winner | Shift since GE2024 | Turnout |
|---|
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 result is on current boundaries. The 2019 row is the UK Parliament's notional recalculation onto the 2024 boundaries (directly comparable to 2024). The 2010, 2015 and 2017 rows are on the boundaries in force at the time and aren't directly comparable.
| 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
- 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.
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