Tony Blair has urged the Labour government to commit to rejoining the European Union within a decade, arguing that Brexit red lines drawn in 2016 should be reconsidered in light of changed circumstances. His think tank has published a report proposing this as a cornerstone of the government's ten-year plan, with Prime Minister Andy Burnham previously declining to rule out including such a commitment in Labour's next manifesto. Blair frames this not as reversing Brexit but as pursuing a modernised relationship with Europe.

Blair's report proposes that Britain should be willing to negotiate on issues including free movement and should only rejoin if the EU undertakes significant internal reforms. The government should simultaneously collaborate with Brussels on defence, artificial intelligence, cyber-resilience, and energy projects, potentially making the North Sea a shared energy hub. Blair suggests Britain could use rejoin negotiations as leverage to influence EU reform. The proposal has been criticised by Conservative politicians, including Shadow Cabinet Office minister Mike Wood, who argues that Labour should instead focus on future policy proposals.