Boris Johnson met David Cameron on the eve of a key Brexit summit, with the pair agreeing Theresa May’s vision for Britain’s future relationship with the European Union was “the worst of both worlds”.

A source has confirmed to Sky News that the foreign secretary and former PM – who were on opposite sides of the Brexit referendum campaign – held talks.

Sky News understands the meeting was a long-standing catch-up, during which a number of issues were discussed.

Mr Cameron called the EU referendum and campaigned for a Remain vote. He resigned the morning after

The remarkable development comes as the prime minister gathers her cabinet at her country retreat of Chequers in a bid to agree on what they want Britain’s post-Brexit relationship with the EU to look like.

Theresa May holding a cabinet meeting at Chequers in 2016
Image: Theresa May holding a cabinet meeting at Chequers in 2016

But there are vastly differing views on how closely, if at all, the UK should mirror Brussels’ rules and regulations when it comes to issues like trade and customs.

Leavers say sticking too close to them would not represent the will expressed by voters in the 2016 referendum to “take back control”, while Remainers argue going too far the other way would lead to chaos for businesses.

The plans being considered by ministers could see the UK keep a “common rulebook” with the EU for all goods, including agricultural and food products.

It has also been claimed that Downing Street is prepared to concede that plans to align the UK with EU regulations in this respect would make a free trade deal with the US unlikely – something Number 10 later came out and dismissed as “categorically untrue”.

Speaking ahead of the summit, which will last well into Friday evening, Mrs May said the government had “an opportunity – and a duty” to reach an agreement.

“We want a deal that allows us to deliver the benefits of Brexit – taking control of our borders, laws and money and by signing ambitious new trade deals with countries like the US, Australia and New Zealand,” she said.

“This is about agreeing an approach that delivers decisively on the verdict of the British people – an approach that is in the best interests of the UK and the EU, and crucially, one that commands the support of the public and Parliament.”

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