The London mayoral election system will revert to a supplementary vote format in the English Devolution Bill, replacing the first past the post method used in 2024. This system allows voters to select a first and second preference candidate, promoting broader appeal among voters. Experts believe this change will primarily benefit Labour, particularly incumbent Sadiq Khan, as the left-leaning vote surpasses the right in London. Historically, most mayors have required a second voting round, indicating a strong influence of this voting method.
The Government has published plans in the English Devolution Bill to ditch the first past the post system that was used in the 2024 mayoral election.
Instead, it proposes to return to the supplementary vote system that has been used for all other London mayoral elections since 2000.
The supplementary vote system gives voters a first and second preference vote and means that the winner is likely to have to appeal to a broader cross-section of voters.
The Labour/left vote is significantly higher in London than the Conservatives/right vote, so Labour probably gains most from this change.
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