Resolves to all of the vote shares reached by Reform UK in the constituency where they have the highest vote share at the next election. The seat of the Speaker of the House of Commons is excluded (because the major parties traditionally do not stand against the Speaker, so minor parties can get unusually high vote shares there).

Candidates suspended from the party still count as long as they appear as "Reform" on the ballot paper (like Neale Hanvey in 2019). It also doesn't matter if the party is renamed.

At the 2019 general election, the Brexit Party (the precursor to Reform UK) achieved their highest vote share in Barnsley Central with 30.4% of the vote; they also achieved over 25% in Barnsley East and in Hartlepool. (They only stood in about half of all parliamentary seats.)