France and Spain have openly welcomed the prospect of Britain rejoining the European Union after British Prime Minister Andy Burnham put full membership back among the options for the country’s long-term relationship with Europe.

French President Emmanuel Macron and Spanish Prime Minister Pedro Sánchez addressed the question during Macron’s state visit to Spain on Wednesday, 30 September. Asked whether Britain could return under Burnham, Macron responded in English: “Welcome back.” He added that a British decision to move in that direction would be good news for both Britain and Europe.

Sánchez was similarly positive, saying Spain would “open our arms” if Britain sought to return.

Their comments followed Burnham’s intervention at the Labour Party conference and subsequent interviews in which he argued that Britain should reconsider the full range of options for its future relationship with the EU.

Those could include remaining under the present post-Brexit arrangements, returning to the customs union or single market, or ultimately “going all the way” and applying for EU membership again.

The remarks extend a debate which had already been developing since Burnham entered Downing Street. In August, EU Today reported that he had told European Council President António Costa that Britain should be “bolder” in rebuilding relations with Brussels.

More recently, the argument has moved from diplomatic language to practical economic questions. Burnham has been pressing Brussels to ensure British companies are not disadvantaged by the EU’s emerging industrial preference rules, with access to the proposed “Made in Europe” framework becoming one of the principal issues ahead of the next EU-UK summit.

Macron nevertheless made clear in Madrid that closer relations could not become a system under which Britain selected individual advantages of EU membership while remaining outside the corresponding obligations.

“You cannot pick and choose among the Union’s freedoms,” he said during the joint press conference with Sánchez.

That question dominated much of the Brexit negotiation after the 2016 referendum. Access to the single market is built around the free movement of goods, services, capital and people, while participation also entails accepting common rules and enforcement mechanisms.

A British application to rejoin would be a separate and considerably larger process. Under Article 49 of the Treaty on European Union, Britain would have to apply for membership and secure unanimous agreement from the existing member states before negotiations could be completed.

A returning Britain could not assume that the special arrangements it held before Brexit would automatically be restored. The UK previously had an opt-out from the euro, remained outside the Schengen passport-free area and benefited from a budget rebate.

Any future terms would have to be negotiated.

Public opinion has also changed since the referendum. A YouGov poll in June found 55 per cent of Britons supported rejoining the EU and 34 per cent opposed it, although support falls when respondents are asked about specific membership conditions.

That shift is not limited to Britain. Polling examined by EU Today earlier this year found substantial support across EU member states for a British return.

For the moment, however, Burnham is not proposing an immediate membership application or referendum.

The next test will be the UK-EU summit expected in November. The meeting was originally planned for July but was postponed following Keir Starmer’s resignation, with EU Today reporting at the time that the political transition in London had complicated preparations.

Burnham wants the summit to advance negotiations on industry, trade and migration and has said he intends to use the period around the meeting to set out the longer-term options available to Britain.

The immediate negotiations are therefore likely to focus on economic integration rather than membership.

Greater access to European markets would almost certainly involve greater regulatory alignment. The political argument in Britain will concern how far the country is prepared to accept common European rules in return for reducing barriers created by Brexit.

Macron and Sánchez have now made clear that, if the discussion eventually moves beyond closer economic cooperation towards membership itself, two of the EU’s largest states would welcome it.