Mid Sussex.

Mid Sussex is a prosperous commuter seat in the South East, built around two large towns and a scatter of smaller settlements between the South Downs and the Surrey border. Haywards Heath, with about 39,000 residents, and Burgess Hill, with about 32,000, together hold roughly three-quarters of the population; Hassocks and Hurstpierpoint add another 14,000, with Cuckfield and a dispersed rural fringe making up the rest. The constituency is older and better-off than the national norm, with a median age of 42 and two in five residents degree-educated. Local services run through a single tier of district government, Mid Sussex District Council, which accounts for all eighteen wards in the seat.

The local political picture has tilted away from the Conservatives in recent years. Across the most recent ward contests the Liberal Democrats have won the clear majority, taking nineteen of thirty-three, with the Conservatives on eight and the Greens picking up four; the Lib Dems carried Hassocks and Hurstpierpoint by wide margins, while the Conservatives held the more rural Downland and Cuckfield wards. That movement was mirrored at Westminster. In 2024 the Liberal Democrats took the seat on 39.6 per cent, with the Conservatives second on 27.1 per cent -- a reversal of 2019, when the Conservatives won comfortably on 53.3 per cent. Alison Bennett has held the seat for the Liberal Democrats since that election.

On the figures available the seat now leans Liberal Democrat at both local and parliamentary level, though the swing is recent enough that it reads as competitive rather than settled. Recent local coverage has had a largely administrative character, dominated by housing allocation, development applications and the unresolved question of local-government reorganisation across Sussex, with little to lift the constituency's national profile. The direction of travel points away from the Conservatives, but a single strong showing offers a thin basis from which to call the seat secured.