Andy Burnham declined to rule out including a pledge to rejoin the European Union in Labour's next election manifesto, responding to direct questioning by describing it as a matter "for another day". His minister for European relations, Hamish Falconer, has similarly refused to exclude the possibility on multiple occasions. This refusal to dismiss the option is significant because incorporating such a manifesto commitment would theoretically grant the Prime Minister a democratic mandate from the British public to pursue rejoin policies.

Public appetite for reversing Brexit is at unprecedented levels, with support for EU membership standing at 61 per cent according to polling expert Sir John Curtice, whilst recent constituency-level polling of nearly 12,000 voters found that all but four constituencies in Great Britain would back rejoining. Burnham's stated priority remains a UK-EU summit scheduled for later this year aimed at repairing diplomatic relations, during which he plans to negotiate a "practical agreement" that could boost the British economy, though he has flagged concerns about the EU's "Made in Europe" policy potentially affecting British industry and supply chains.