The increased willingness of voters to vote tactically in the 2024 general election put the Conservatives at risk in a large swathe of seats, which became known as the Blue Wall.
This vulnerability became apparent just a month after the Conservatives won the Hartlepool by-election in 2021. On 17 June 2021, the party lost a by-election in Chesham and Amersham, a constituency which had been Conservative since its creation. It was won by the Liberal Democrats on a huge swing of 25 points. The Conservative share of the vote fell from 55.4% to 35.5%. The result was initially put down to local concerns regarding HS2 and the relaxation of planning controls. However, the result was an indication that the Tories were vulnerable to tactical voting in constituencies in traditional conservative seats in Southern England, which had voted against Brexit and were becoming more liberal.
Many constituencies in the south have been changing demographically as younger, more liberal graduates move out of London in search of cheaper housing. Mike Martin, the Liberal Democrat candidate in Tunbridge Wells, estimated that around 3,000 people had moved into his constituency every year since 2019. Tony Travers, a director of LSE London, a research centre at the London School of Economics, argued the Chesham and Amersham by-election result was the result of this gradual “erosion of the Tory party’s traditional rock-solid voter base in the south-east of England.”
Travers believed that demographic changes were significant, noting that in a typical year, more than 200,000 people move out of London to the south-east and east. Travers argued that Labour votes were effectively being exported to the wider region. As evidence, he pointed to the 2019 local elections, where the Conservatives faced sudden and vast losses of councillors in places such as Chelmsford, Chichester, East Cambridgeshire, Guildford, South Oxfordshire, Vale of White Horse, Winchester, Woking, Surrey Heath and Spelthorne.
The day after the by-election, Ed Davey, the Leader of the Liberal Democrats, took an orange mallet to a wall of blue bricks with an orange mallet to symbolise his party's victory. The Guardian used the photo in an article published on 19 June 2021, headed ‘The Blue Wall: what next for the Tories after a shock byelection defeat?’ The article identified 29 Blue Wall seats where the Tory majority was below 30%, the Liberal Democrats came second, and the Leave vote was below 53%. These were:
Steve Akehurst identified a similar group of Blue Wall seats, which were historically Conservative but where he believed the party could lose because of tactical voting. Akehurst specifically identified seats where:
These seats were primarily in suburban areas in England, often on the outskirts of cities or large urban conurbations. Akehurst argued that voters in these seats were more likely to focus on issues like housing and the environment rather than immigration. They were also more pro-EU and liberal than the new Conservative voters in the Red Wall and felt increasingly distant from the Tory Party.
There was growing evidence that the 2024 general election could see high levels of tactical voting. A month before the election, one in five voters in a YouGov survey said they would be voting tactically, with three quarters saying they would be willing to do so to stop a Conservative from winning their seat. To cater for these tactical voters, many websites were set up to identify the party best placed in individual constituencies to beat the Conservatives. These included Tactical Voting, Stop the Tories, and Best for Britain. Naomi Smith, CEO of Best for Britain and founder of the tactical voting platform GetVoting.org, claimed that over ten million people were willing to vote tactically for change in 2024.
The increasing willingness of people to vote tactically, combined with the changing demographic nature of Blue Wall seats, made the Conservative Party particularly vulnerable in these constituencies.
The 2024 election result
The party was devastated in the traditional Conservative home counties’ heartlands. For the first time since 1906, Tories didn’t win a majority of southern seats. In Berkshire, Bedfordshire, Buckinghamshire, Hertfordshire, and Oxfordshire, the party lost 26 seats.
Many of the seats the Conservatives lost in 2024 had been held by the party for a very long time:
The Liberal Democrats took seats from the Conservatives in some of the country’s wealthiest areas that have the highest proportions of people in managerial and professional occupations.
While the Liberal Democrats failed to take the seat of the former chancellor Jeremy Hunt, it won the seats of three Conservative ex-Prime Ministers:
The success of the Liberal Democrats in winning 72 seats was down to their efficient, concentrated geographical vote and tactical voting. In the 2024 election, their vote went up in seats where they were challenging the Conservatives but fell slightly in other seats.
According to Chris Annous of More in Common, over a quarter (26%) of Liberal Democrat voters in 2024 said they had voted tactically. Data from the post-election British Election Study revealed that in seats where the Liberal Democrats were challenging the Conservatives, half of 2019 Labour voters, who had become more positive towards the Lib Dems, switched their vote to help the party defeat the incumbent Tory MP.
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