Horsham.

Horsham is a market-town seat in the western Weald of West Sussex, anchored by the town of Horsham itself, home to a little under half its 103,900 residents. Beyond the town the seat thins into a network of smaller settlements -- Southwater, Billingshurst and Broadbridge Heath each hold around a tenth -- with a fringe of villages and a strip of the Crawley built-up area completing the picture. It is a comfortable, ageing seat: the median age is 43, more than a third of adults hold a degree, and the population is overwhelmingly White. Local services across all sixteen wards fall to a single district authority, Horsham District Council, with West Sussex running county-tier functions above it.

The seat's politics have moved sharply in recent years. Across the twenty-eight most recent ward contests the Liberal Democrats have taken twenty-three to the Conservatives' five, a clear direction of travel that has reshaped what was once solidly Conservative ground. That shift was confirmed at the 2024 general election, when the Liberal Democrats won on 39 per cent against a Conservative runner-up on 34, overturning a Conservative majority that had stood near 57 per cent of the vote only five years earlier. John Milne, elected for the Liberal Democrats in 2024, sits within that broader local realignment rather than at the head of it, and has so far shown no whipped dissent.

On the figures available the seat now leans Liberal Democrat at both tiers, though the narrowing parliamentary margin suggests it remains genuinely contested rather than settled. Recent local coverage has had a markedly administrative character, dominated by reorganisation of Sussex local government and a reopened development plan, with friction over both. Taken together the picture is of a seat in flux: recently realigned, closely fought at Westminster, and preoccupied for now with the machinery of council reform.