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There's no reference in the thread to which areas of the UK have been excluded, although those figures show nothing for SNP, PC or any NI parties, and total to 603.
Given 650 constituencies, with 533 in England, 40 in Wales, 59 in Scotland, and 18 in Northern Ireland, you can't get to 603 MPs with any combination of whole nations.
Much as I want to believe that analysis, I'd be more comfortable with their maths if they explained the gaps.
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They have the full breakdown with all parties here
https://www.electoralcalculus.co.uk/prediction_main.html
Bit more analysis in the thread
https://x.com/MarwanData/status/1796633036395622814?t=275pGPt7PGpDD-Igsf8dxA&s=19