Liberal Democrat MP for Kingston and Surbiton Ed Davey. Photo: John Stillwell/PA Wire/PA Images

“Mr Johnson has betrayed his country. That’s unforgivable. People need to know what a traitor he is.”

Ed Davey, Lib Dem MP and former cabinet minister, took no prisoners in his assessment of government Brexiteers—and one Brexiteer in particular. Boris Johnson’s insistence over the weekend that Brexit will indeed free up £350m for the NHS “shows you what a despicable man he is. How anyone can think he’s fit for office is a joke.”

In an exclusive interview with Prospect, Davey continued his remarkable assault on the Foreign Secretary. “Duplicitous liar doesn’t come close to that man,” he said. “He’s held in the lowest regard of any foreign secretary of modern times, including by the countries we regard as our closest allies.”

“I’m probably doing any shred of relationship with him fatal damage,” Davey said, “but I don’t care.”

The former energy secretary paused for breath. We were downstairs in a deserted hotel bar during the Liberal Democrat Autumn conference in Bournemouth. The theme tune to Snoopy played on the hotel speakers—on repeat. The surreal atmosphere was punctured by yet another stinging accusation from Davey.

Earlier this week David Norgrove, chair of the UK statistics authority, reprimanded Johnson over his £350m figure, which he said was a misuse of the figures. An almighty row ensued. Davey suggested to me the stats body would be at risk if Johnson replaced Theresa May: “In the long term if he becomes PM I worry about the independence” of the body “because an inveterate liar like Boris Johnson won’t want to be brought up on how to count by them.” John…

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