David Cameron has warned Andy Burnham against dragging Britain back into the European Union. Lord Cameron urged the Prime Minister not to trigger a โ€œdecade-long debateโ€ on rejoining the Brussels club.

The former PM, who fronted the campaign to Remain and quit after losing the 2016 referendum, insisted that starting a conversation about returning the bloc would be โ€œvery long and painfulโ€. It comes as Mr Burnham is looking at options for the UK’s future relationship with the EU.

In a bombshell intervention, the Tory grandee said he was โ€œdesperately disappointedโ€ when the country voted to leave the bloc 10 years ago but warned against reversing the decision.

Lord Cameron told Bloomberg: โ€œInstead of launching an argument about rejoining, which I think would be a very long and painful argument โ€“ and who knows where it would end up โ€“ instead of that, focus on how do we be the best friend, best neighbour, best partner.”

He said that โ€œflirting with rejoiningโ€ could undermine efforts to get a better partnership deal with the bloc, because EU countries may think there is no point in doing so if the UK is set to rejoin anyway.

โ€œIf youโ€™re not going to, you know, commit to trying to make the partnership stronger because youโ€™re flirting with rejoining, I think thereโ€™s some dangers there,โ€ he said.

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Lord Cameron also denied the UK’s economic problems are down to Brexit.

He said: โ€œOur economic problems are we are overspending, over-borrowing, over-taxing, over-regulated, and far too much being spent on working-age welfare. Those are a set of problems that have nothing to do with Brexit.

โ€œDo we really want to go into another decade-long debate about whether we should be in or out, when actually we should deal with our own problems while making the partnership model work?โ€

The PM is due to set out options on the future relationship with Brussels next week but he has insisted voters would ultimately be โ€œthe bossโ€ of any changes.