Ten years after the 2016 referendum in which 52% voted to leave the EU, the article tallies Brexit's costs: an NBER working paper puts the cumulative GDP hit at 6% to 8%, sterling has never recovered, and Keir Starmer is the sixth PM to leave office since the vote, none lasting over three years. Rejoining is on no major party's platform even as a June 2026 YouGov poll finds 57% of Britons say leaving was wrong, and the article argues the bill is still adding up.