Mr Martin, who launched JD Wetherspoon in 1979, has been a familiar figure alongside Nigel Farage over the course of the past three years, and, like the Brexit Party manager, shares some scepticism about Mr Johnson’s ability to deliver a clean Brexit by his stated deadline of October 31. He told Express.co.uk: “My overall assessment of the situation is that the three main political parties have been in thrall to their Remainer factions.” From Theresa May and her advisors in the Conservative Party, to Labour’s Keir Starmer and Emily Thornberry, and Vince Cable and Nick Clegg in the Liberal Democrats, all three parties had been dominated by Europhiles for decades, as was the CBI, he said. Mr Johnson launched his campaign to succeed Theresa May as Conservative Party leader, and Prime Minister, this week, subsequently winning the backing of 114 MPs in the first ballot.
However, Mr Martin added: “The problem for Boris Johnson and the Conservative Party therefore is that if Britain wants to leave the EU, what deals does he have with his own party to deliver that.
“Brexiteers genuinely have seen that the main political parties have not carried through on the promises made three years ago.
“They much prefer Boris to anyone else – but what does Boris have to give his party’s orthodoxy, as outlined, to get their backing?
“Rory Stewart has already said he can’t back a no deal Brexit, as has Oliver Letwin plus of course lots of Labour’s front bench.
Rather than compromising, Mr Martin wanted to see any future British Prime Minister adopt a much more bullish approach.
He said: “The majority of Brexiteers believe that no deal is a much better way to leave.
“The real danger is that Boris signs an agreement to leave and 90 percent of the current withdrawal agreement gets chucked in there with a couple of minor tweaks to the backstop.”
In order to win over sceptical Brexiteers, current frontrunner Mr Johnson would need to be able to offer cast-iron guarantees about securing British fishing rights and control of import tariffs after Brexit, Mr Martin said.
He added: “The other thing is this October 31 deadline. We don’t want yet more dreadful prolonging of the agony, yet more transition.”
In his time campaigning for Brexit, Mr Martin has met Brexit Party leader Nigel Farage on numerous occasions and acknowledged the erstwhile Ukip leader, who asked recently why he should “trust” Mr Johnson, remained sceptical.
He added: “I don’t know what Nigel Farage’s intentions are but there’s a great song by the Who (and Roger Daltrey is a Brexiteer of course) and that’s Won’t Get Fooled Again.
“That’s the big danger – everyone gets behind him and then we don’t get what we want.”
Mr Martin was particularly scathing about Theresa May’s withdrawal agreement, defeated three times in the House of Commons, which he said “everyone hates”.
He said: “I think this is a critical thing for the British and for Brexiteers.
“Don’t go back and try to negotiate with Brussels yet again – I’ve been in business long enough to know you have to know when to walk away.
“I’ve met Boris a couple of times and he seems a nice enough bloke. But if he even dreams of going to Brussels to renegotiate this deal he better wake up and apologise.”