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Eh? What am I trying to confirm? I honesty think you'll find cases where Labour have increased their vote share and cases where Reform have split the vote.
The hypothesis is this: Labour increased it's vote share in seats that previously were Tory.
We can test that really easily by just comparing 2024 vs 2019. (Has labour's percentage gone up in seats previous Tory).
However, we know that 2024 and 2019 are not comparable because Brexit stood down in 2019. Therefore we have to account for that change. This is why you need to include Reform in any calculation.
I'm a bit lost as to what you think I'm actually interested in.
Hence:
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Why? Possible I'm missing something but it seems like pretty low hanging fruit in terms of a very simple overview of voting behaviour that accounts for Reform.