Riding profile

Swindon South

UK constituency — England · Urban · south west

The question

Swindon South: who wins this toss-up?

Editorial read

Swindon South, an urban constituency in England, elected a member with Labour in the previous cycle, with a 21-point margin. The Vote-Scope model projects Labour ahead at 30% vote share, against 27% for Reform UK, and the race could swing.

Sitting member

Heidi Alexander

Sits with Labour

Since
2024-07-04
Parliament
59th

Current forecast

Labour

Toss-up

Probability
100%
Mean margin (pts)
0.9
P(close race)
100%

Projected vote share

Projection by party

  • Labour 29.9%
  • Reform UK 27.4%
  • Conservative 22.1%
  • Green 11.8%
  • Lib Dems 6.1%
  • Other 2.4%

In context

How this riding stacks up

Labour Reform UK Conservative Green
HereSwindon South 29.9%27.4%22.1%11.8%
National averageUnited Kingdom 21.7% +8.2 25.3% +2.1 18.9% +3.3 11.8%

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

Previous election · UK 2024

Won by
Labour
Margin
21.4 pts
Margin shift vs current projection
-20.6 pts

Detailed result · UK 2024

Candidates and votes

Candidate Party Votes % Occupation
Heidi Alexander Elected Labour 21,676 48.4
Robert Buckland Conservative 12,070 26.9
Catherine Kosidowski Reform UK 6,194 13.8
Roderick Hebden Green 2,539 5.7
Matthew McCabe Lib Dems 1,843 4.1
Martin Costello Other 472 1.1

Demographics

Who lives here

Population
113,834
Median age
39
Employment rate
76.3%

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

Last model run
Cycle
uk_2029