The calculator uses Universal National Swing, a fairly simple way of calculating seats which applies the national polling swing across all constituencies
xander012 on
Oh god please be tight so my MP actually does her job (I haven’t met a single person with a positive opinion of my MP, transcending party lines too in this case.
That being said, rather the useless MP I know than a Reform MP.
Simplyobsessed2 on
British politics is kind of interesting at the moment, it might be going through a once in a century realignment with the Conservative party – often described as the most successful political party in a democratic country in the world – becoming increasingly irrelevant and potentially being relegated to being one of the minor parties.
![[OC]An electoral map of Great Britain shaded by constituency seat marginality, based on the latest GB voting poll](https://www.byteseu.com/wp-content/uploads/2025/12/2u5evsi13dag1-974x1024.png "[OC]An electoral map of Great Britain shaded by constituency seat marginality, based on the latest GB voting poll")
3 Comments
Submitted this last week but needed to make some fixes
I have a UK election seat calculator – I’ve added functionality to display constituencies based on margin:
Very tight (0-2%)
Tight (2-5%)
Close (5-8%)
The above image is based on the latest poll from UK pollster Find Out Now
Interestingly, 45.7% of GB seats are considered marginal here, illustrating the increasing competiveness of UK politics
Data: Publicly available polls, GE2024 Results from the House of Commons Library, ONS Constituency Boundary Data
Tools: GeoJson and D3 maps
[pollcheck.co.uk/custom_seat_calculator/](http://pollcheck.co.uk/custom_seat_calculator/)
The calculator uses Universal National Swing, a fairly simple way of calculating seats which applies the national polling swing across all constituencies
Oh god please be tight so my MP actually does her job (I haven’t met a single person with a positive opinion of my MP, transcending party lines too in this case.
That being said, rather the useless MP I know than a Reform MP.
British politics is kind of interesting at the moment, it might be going through a once in a century realignment with the Conservative party – often described as the most successful political party in a democratic country in the world – becoming increasingly irrelevant and potentially being relegated to being one of the minor parties.