Keir Starmer making his speech at the Guildhall.

Keir Starmer has launched an outspoken attack on the “wild promises” made by Brexiteers as he warned against calls for the UK to next quit Nato and the European Convention of Human Rights.

In outspoken comments, the prime minister said the country was still “dealing with the consequences” of the vote to leave the European Union in 2016.

In his annual Lord Mayor’s Banquet speech at the Guildhall in London, Starmer said it had harmed the economy and led to “the degradation of political debate”.

The PM said: “For decades there was a broad consensus about Britain’s role in the world; a consensus that transcended party politics, and sometimes deep disagreements about specific issues.

“We were of one mind – that Britain should be outward looking, engaged and active on the world stage, a powerful voice at the top table. That was taken as a given, part of who we are in line with the greatest traditions of this country. But then Brexit broke that consensus.

“I want to speak very frankly. The Brexit vote was a fair, democratic expression, and I will always respect that.

“But how it was sold and delivered was simply wrong. Wild promises were made to the British people and not fulfilled. We are still........

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