Portsmouth North.

Portsmouth North is a wholly urban seat in the South East, drawn entirely from the northern districts of Portsmouth, a city of roughly 100,000 people that fills the constituency in full. It is a younger-than-average, densely built area, with a median age of 39 and a population that is 90.5 per cent White at the last census. Just over a quarter of residents hold a degree, below the national share for England. A single authority runs local services here -- Portsmouth City Council, a unitary covering all seven of the seat's wards -- so there is no county-district split to complicate the picture.

The recent ward picture is fragmented rather than settled. Across the seven most recent contests, held in May 2026, Reform UK took four wards, the Liberal Democrats two and the Conservatives one, with Reform's margins widest in the northern wards and the Liberal Democrats holding ground nearer the centre. At the 2024 general election the seat moved to Labour, whose Amanda Martin won on 34.9 per cent against a Conservative runner-up on 33.0 -- a margin of under two points, and a sharp narrowing from the comfortable Conservative win of 2019. On the figures available, no party commands the seat outright.

The direction of travel, then, is towards genuine contest rather than consolidation, with the council itself facing reorganisation and recent coverage tending towards the administrative. Reform's advance across the northern wards has not yet been matched at Westminster, where Labour's lead is slim and the Conservative vote has fallen back. Recorded violence and sexual offences, and shoplifting, both appear to run materially above the average for comparable seats. Taken together, the evidence points to a seat in flux: recently flipped, locally divided, and held on thin margins.