
Downing Street officials have been consulting thinktanks and pollsters to test public backing for reversing Brexit, after Prime Minister Andy Burnham announced a review of Britain's European options that will include full rejoining. French president Emmanuel Macron responded "Welcome back", and a UK-EU summit is now being discussed for 20 November. If pursued, it would mark a potential return of a major European power to the EU's political orbit, a step toward deeper European consolidation, though no negotiation or manifesto pledge has yet been made.