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By-Election Wins Cement Labour As Election Frontrunners

UK

Two parliamentary by-elections held on 15 Feb have delivered defeats for the incumbent Conservatives, with the main opposition Labour party overturning sizeable majorities in both. In the seat of Wellingborough, Labour overturned an 18.5k vote majority on a swing of 28.5%, the second-highest swing from Conservative to Labour in any constituency since the Second World War. Labour also comfortably overturned a 11.2k Conservative majority in the southwest English seat of Kingswood. The results have not led to a shift in political betting markets, with Labour already viewed as strong favourites to win a majority in the next general election.

  • The past few days have been difficult for both major parties. PM Rishi Sunak's Conservatives have had to deal with the fallout of the economy entering a techical recessionon the day the by-election was held, while Labour's Sir Keir Starmer on the other hand has faced the resurgent issue of antisemitism within his party.
  • In terms of implications, the by-elections can also be viewed through the lens of when the general election will take place. Q424 is still seen as the most likely time, with a 71.4% implied probability according to data from Smarkets. Q224 has fallen in the past week, from 15.2% to 11.6%. The prospect of a January 2025 election, the latest possible date, has risen to 9.1%, the highest for this time period since Nov 2023.
Chart 1. Political Betting Markets Implied Probability of Date of Next Election, %

Source: Smarkets

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