Boris Johnson and the Brexiteers have been dealt a second heavyweight statistical blow to their renewed efforts to sell a blatant lie to the British people.

In an article announcing a Tory leadership coup on Saturday, Johnson insisted we will definitely be £350m a week richer after leaving the EU.

Less than 24 hours later, the head of the UK Stats Authority expressed his “disappointment” that he had repeated a claim based on a “clear misuse of official statistics.”

But it gets worse – much worse – for Johnson and his post-truth pals today.

The Institute for Fiscal Studies has shown how the Government’s own figures prove the £350m claim is a lie.

Not only that, but the Government’s forecast for public finances puts us on course to be £15 billion a year – or £300m a week – poorer “as a direct result of the Brexit vote.”

Here’s the letter in today’s Telegraph from the IFS’s deputy director, Carl Emmerson. Read it and weep, Bojo:

The government has an official position on fiscal effects of Brexit. This is it. pic.twitter.com/1qdlGAOsf1 — Paul Johnson (@PJTheEconomist) September 19, 2017

If Johnson disagrees with the official position of the Government, then surely he should resign.

Now, any volunteers to drive a bus with “we’ll lose £300m a week when we leave the EU” across the country?