Brentford & Isleworth.

Brentford and Isleworth is a west London seat, densely urban and notably young, with a median age of 36 and a population of roughly 128,000 across the 2023 boundaries. It is dominated overwhelmingly by the built-up area of Hounslow, which accounts for more than nine in ten residents; a sliver of Richmond upon Thames makes up the remainder. The seat is diverse, with under half of residents recorded as White at the last census, and unusually well-qualified, around 45% holding a degree. Local services are run by two London borough authorities, Hounslow for ten of its wards and Richmond upon Thames for the eleventh.

Politically, the constituency leans firmly to Labour, though the ward picture has grown more crowded. Across the most recent borough contests, in May 2026, Labour took the large majority of wards, but the Liberal Democrats, Greens and an independent grouping each picked up ground, and a Conservative topped the poll in one. At the parliamentary level Labour won in 2024 on 44.2%, with the Conservatives a distant second on 22.5%, a wider margin than the raw figures suggest. Ruth Cadbury has held the seat for Labour since 2015, with no record of whipped dissent in the past 90 days; her recent contributions have centred on the economy, transport and local government.

The direction of travel is towards a more contested borough rather than a settled one. Recent local coverage has dwelt heavily on a tightening council picture, in which Labour's grip, while intact, appears narrower than before. On the figures available the seat remains comfortably Labour at Westminster, even as ward-level competition fragments across several parties. Among recorded crime, vehicle crime appears to run well above the constituency average, with shoplifting and anti-social behaviour also elevated. On balance the seat looks safe at the parliamentary level but increasingly fluid beneath it.