Riding profile

Portsmouth North

UK constituency — England · Urban · south east

The question

Portsmouth North: who wins this toss-up?

Editorial read

Portsmouth North, an urban constituency in England, elected a member with Labour in the previous cycle, with a 2-point margin. The Vote-Scope model projects Reform UK ahead at 32% vote share, against 29% for the Conservatives, and the race could swing.

Sitting member

Amanda Martin

Sits with Labour

Since
2024-07-04
Parliament
59th

Current forecast

Reform UK

Toss-up

Probability
100%
Mean margin (pts)
3.0
P(close race)
100%

Projected vote share

Projection by party

  • Reform UK 31.8%
  • Conservative 28.6%
  • Labour 20.3%
  • Lib Dems 10.3%
  • Green 7.8%
  • Other 1.0%

In context

How this riding stacks up

Reform UK Conservative Labour Lib Dems
HerePortsmouth North 31.8%28.6%20.3%10.3%
National averageUnited Kingdom 25.3% +6.4 18.9% +9.7 21.7% −1.4 11.6% −1.4

Nationwide averages computed across the 650 riding-level projections (unweighted mean).

Previous election · UK 2024

Won by
Labour
Margin
1.9 pts
Margin shift vs current projection
+1.2 pts

Detailed result · UK 2024

Candidates and votes

Candidate Party Votes % Occupation
Amanda Martin Elected Labour 14,495 34.9
Penny Mordaunt Conservative 13,715 33.0
Melvyn Todd Reform UK 8,501 20.4
Simon Dodd Lib Dems 3,031 7.3
Duncan Robinson Green 1,851 4.5

Demographics

Who lives here

Population
100,849
Median age
39
Employment rate
79.1%

Data source : ONS mid-2022 population + Jan 2026 labour market

Last model run
Cycle
uk_2029