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Sadiq Khan today promised to hold urgent talks with David Davis on the prospect of London staying in the single market after Brexit.

The Mayor said he would press the Brexit Secretary for a bespoke deal for the capital within days of returning from his Indian trade mission.

He said: “I’m meeting David Davis shortly and will raise the issue of London’s access to the single market and customs union as a matter of urgency.”

City Hall officials said he considered the matter a top priority after claims that Downing Street plans to keep Northern Ireland aligned with some EU laws.

Mr Khan said the deal meant the Government had accepted the principle of different parts of the UK having bespoke arrangements with Brussels.

He claimed the potential Northern Ireland arrangement — which insiders suggested could be limited to “a degree” of alignment — opened the door for London to stay in the single market.

The Mayor said he could work with Nicola Sturgeon, the First Minister of Scotland — which like London voted Remain — to press for a deal.

He suggested that Brussels chiefs were “amenable” to the idea of the capital having its own relationship with the EU, potentially even by staying in the single market and customs union. Rumours that they could consider a bespoke deal with London first emerged after Mr Khan met EU figures Donald Tusk, Jean-Claude Juncker and Guy Verhofstadt in Brussels earlier this year.

Mr Khan said: “If it is the case that the entire country doesn’t stay in the single market and customs union then I’m sure that the EU, as demonstrated by their willingness to do a deal with Northern Ireland, would be amenable to a conversation with London.”

He said he was prepared to work with Ms Sturgeon, who today demanded that Scotland should be allowed to opt out of parts of Brexit.

“If us working together leads to our economies doing better than they otherwise would be I’d be very happy to work with Nicola Sturgeon,” Mr Khan said.

The Mayor said a leaked draft document that seemed to claim that Northern Ireland could continue to have regulatory alignment with Brussels “beggars belief”.

“The Government has accepted that it’s not one-size-fits-all across the entire UK. I will say to them that if it’s good enough for Northern Ireland, it’s good enough for London,” he said. “Bearing in mind membership will lead to tens of thousands of jobs being protected, we should have the same deal in London.”

Mr Khan dismissed suggestions that such a move could lead to the three boroughs that voted Leave calling to join a full Brexit as “facetious”.