John Bercow has made his debut in the Labour Party telling “comrades” how to defeat the “worst Government of his lifetime”.

The former Conservative MP, who became the scourge of Brexiteers as Commons speaker and switched allegiances to join the Labour Party earlier this summer, told a packed fringe event in Brighton what the vulnerabilities of the Conservatives are.

He insisted Labour has got to “excite” people and come forward at the next general election with a “limited number” of “very clear” policies.

Mr Bercow, who has been Essex University chancellor since 2017, said: “The Conservative Party always used to be said to be ‘cruel but efficient’.

“Now, if they do not lose their reputation for being cruel, and there is no imminent likelihood of that loss, they have acquired a reputation for being inefficient, incompetent and incompetent on an industrial scale.

“The task of the political craftsmanship of the Labour Party is to expose those errors clinically, repeatedly, persistently.”

Mr Bercow then noted that, as former prime minister Margaret Thatcher discovered, big majorities can lead to “arrogance and dismissiveness and carelessness”.

He went on: “And I think that this Government, with its very large majority, will fall victim to that arrogance, that presumption.”

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On what the party should do next, he said: “The Labour Party has got to excite people.

“It has got to excite people.

“It is not good enough to just have a good set of good policies.

“In fact, I would go as far as to say, that my feeling is that the Labour Party in the next election doesn’t need to have a a vastly, detailed, lengthy manifesto with dozens and dozens of commitments.”

The former Commons Speaker added: “The Labour Party has got to thrust to the fore alongside Keir who is a formidable prosecutor, a formidable advocate, and other personalities part of the leadership team, which can reach out to people and persuade people that they are different from and preferable to this shower, which frankly represents the worst government of my lifetime.”

On Sir Keir Starmer, Mr Bercow said he is a “good guy” but that the Labour Party has got to develop a “narrative” and clear policies”.

When asked about Labour deputy leader Angela Rayner, who recently described senior Tories as “scum”, Mr Bercow said he would have not chosen that term but insisted people should not get on their “moral high horses” about it.

He said: “I wouldn’t have used that term, but I think that people are passionate.

“I know Angela well and she’s a passionate person and she believes in her values and she feels very, very angry about what is being done to this country by a Conservative Government.

“Do I think Angela Rayner, should be damned to perdition for that one comment?

“Absolutely not.

“I think Angela Rayner is a damn good person, she has got strong and good values.

“I wouldn’t have used that expression but I don’t think we should get on our moral high horses about it.”

The former Conservative MP for Buckingham, who repeatedly addressed the audience as “comrades”, revealed he had no interest in a career in the Labour Party and did not intend to stand for Parliament again.

However, he said he “absolutely” wanted to join a trade union in the near future but had not done so yet.