Andy Burnham never said the word “rejoin” from the stage in Liverpool. It took a morning radio interview the next day, and a question he chose not to dodge, for a British prime minister to say aloud that going “all the way” back into the European Union was one of the options on the table.

The distinction matters, because the reaction since has outrun the facts. Paris and Madrid have already offered their welcome. London has announced no application, no referendum and no change in government policy.

Two events, not one

On Tuesday 29 September, Burnham delivered his Labour conference speech. Video of the speech shows a leader edging toward the subject without crossing the line. He said Brexit had done more harm than good, and he said an EU-UK summit later this year would be the moment to lay out the choices facing the country.

The sharper remarks came on Wednesday 30 September, on BBC Radio 4’s Today programme. Asked whether the options could include full membership, Burnham set out a menu of four. “We could stay as we are,” he said. “We could look at what George Osborne has said about a customs union, we could look at what the Liberal Democrats said about the (EU) single market, or we could go all the way.”

That is a list of possibilities, not a plan. Burnham has not announced a bid to rejoin. He says he will set out the models around the UK-EU summit expected in November.

A shift in tone, if not yet in policy

Even so, the language marks a change. Labour’s 2024 manifesto ruled out returning to the Single Market, the Customs Union and freedom of movement. Burnham’s own position has also moved: in May, he said he was not proposing that Britain consider membership.

His past statements are not entirely consistent either. Reuters reported in June that he had once said he wanted Britain to rejoin in his lifetime, then later described membership as not a priority.

AFP characterised the moment as the breaking of a taboo for a sitting prime minister. The New Union Post went further, calling him the first post-Brexit PM to put rejoining back on the table at Downing Street, but that is one outlet’s framing and should be read as such.

Europe leans in

The warmest response came from Madrid. At a joint press conference on 30 September, French President Emmanuel Macron and Spanish Prime Minister Pedro Sánchez both welcomed the prospect.

“If the British want to come back and if the prime minister is moving in that direction, I think that is very good news both for his country and for Europeans,” Macron said. He then added two words: “Come back.” Sánchez said Spain would “applaud it and open its arms again to a brotherly people.”

The European Commission was more guarded. Chief spokesperson Paula Pinho responded cautiously on 1 October, and the briefing is available in the Commission’s video archive. Brussels, in other words, is waiting to see whether the signal turns into a proposal.

The politics at home

The domestic fallout is already forming. The Conservatives are accusing Burnham of reopening Brexit divisions, and the argument looks set to become a dividing line at the next general election.

The public mood gives the debate some weight. Polling reported this year puts support for rejoining at 55 or 56 percent, though outlets disagree on the pollster, with some attributing the figure to Survation and others to YouGov. Those numbers sit against a 2016 referendum that produced 51.9% for Leave and 48.1% for Remain, on a turnout of 72.2%.

Burnham’s rise to this point has been fast. Keir Starmer announced his resignation on 22 June 2026. Burnham became Labour leader on 17 July and prime minister on 20 July, the seventh PM in a decade. In July he told European Council President António Costa he wanted a closer relationship with the bloc, and in September he met Commission President Ursula von der Leyen at the UN General Assembly. The UK government says the two discussed the next EU-UK summit, which was postponed earlier because of the July change of government.

What rejoining would actually take

Burnham’s four options are not equal in difficulty. The first three are variations on negotiation between London and Brussels. The fourth is a different order of undertaking.

Under Article 49 of the Treaty on European Union, rejoining would require a formal application, unanimous approval from the Council, the consent of the European Parliament, and ratification by every member state. No application has been announced, and the research so far has found no statement on a referendum, cabinet endorsement or official government line.

Meanwhile, the existing relationship is still being worked on. The Commission says technical talks continue on defence, migration, Ukraine and AI. Three negotiating strands remain open: sanitary standards, linking emissions trading systems, and youth mobility. Any of those could produce a concrete result before the larger question is settled.

What to watch

The November summit is the next test, though no date has been confirmed. Burnham has promised to present the models then, which means the vague menu he offered on the radio will have to become something sharper.

The real question is which of the four options he chooses to champion, and whether his party follows him there. A prime minister who raises the possibility of rejoining has opened a debate. Whether he is willing to lead it is a separate matter, and the answer will be clearer by the end of the year.