General Election — First Past the Post
650 seats · 326 to winSet each party's national vote share, political position, and geographic spread. Each of the 650 seats starts from its 2024 baseline; your changes apply as proportional swing shaped by ideology and demographics (the Electoral Calculus approach). The winner in each seat takes it — no prizes for second.
House of Commons (650 seats)
| Party | Votes % | Seats | Seat % | vs 2024 | Share of Commons |
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The 650 constituencies are stylised (named by region and type) but calibrated so that regional seat counts and every party's national seat total exactly match the real 2024 general election. The Speaker's seat is uncontested by convention; the six independent-held seats keep their local vote.
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Custom Political Position Builder
Define how a new political position performs across seat types. Positive values boost a party's vote there, negative values cost it. The Brexit lean tilts the party towards Leave- or Remain-voting seats. Saved positions appear in the simulator's position dropdown.
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Pacts & Tactical Voting
Anti-split arithmeticUnder first-past-the-post, two parties splitting the same vote can lose seats both would win alone. Model the fix two ways: a formal stand-aside pact, where only the strongest partner contests each seat, or an informal tactical squeeze, where voters desert weaker partners only in seats that are genuinely winnable.
Transfers are never perfect: in a stand-aside pact the votes that don't transfer are treated as abstentions and drop out of the count, which is what usually happens when a party asks its supporters to back a rival.
Constituency Map
650 hexes · 1 seat eachEvery constituency is one hexagon of equal size, clustered by region into the shape of the UK — so a rural seat the size of a county counts the same as a square mile of inner London, exactly as it does in the Commons. Hover any hex for its result.
Forming a Government
326 to winWho can command the confidence of the Commons? Sinn Féin MPs do not take their seats and the Speaker does not vote, so the working threshold is usually below 326.
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Build a coalition
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