The former chief adviser to the Prime Minister is famed for his outspokenness and distaste of Westminster’s London-centric bubble. And while the former Vote Leave director admitted that Brexit might have been “a mistake”, he was under no illusions about its impact on the UK democratically.

       Last night he tweeted: “An advantage of Brexit is now it's clear who has responsibility for fixing it, our democratically elected MPs.

       “If they don't fix it, & we continue with broken system & without a serious emergency system, it's a data point for 'Brexit hasn't worked as intended'

       “If it improves…”

       Disregarding the maverick adviser’s point, Dr Mike Galsworthy responded by referencing the campaign’s red bus which sported a slogan claiming that leaving the bloc would allow the government to give the NHS an extra ￡350million a week.

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       The founder of the Remain group Scientists4EU said: “That’s not what was written on the bus…”

       This was instantly shut down by Mr Cummings, who responded: “'Take back control' (another campaign slogan) was on the bus...

       “This is literally what it means...

       “5 years on, elite-Remain-Twitter is still at the start line…”

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       In an interview with the BBC last month, Mr Cummings admitted that the bus’ slogan was deliberately chosen to “drive the Remain campaign crazy”.

       His outburst came as a shocking report revealed the economic damage that Brexit has wreaked on the economies of numerous EU countries.

       Facts4EU.Org said Germany came out as the biggest loser after its economy was down ￡12.2billion in the last 12 months compared with 2016 - the year of the referendum vote.

       It was followed by Belgium (￡3.7billion), France (￡3.3billion), the Netherlands (￡2.7billion), and Spain (￡2.6billion).

       The website also revealed that UK consumers bought ￡28billion less from the EU last year than in the referendum year.

       In data gleaned from the Office for National Statistics (ONS) it found that Sweden sat in sixth place - down ￡1.2billion.

       It was followed by the Czech Republic (￡1.1billion), Italy (￡0.7 billion), Slovakia (￡0.4billion) and Portugal (￡0.4billion).

       The website claimed this loss of trade was not a “Covid effect” or because of new border controls.

       In a statement it added: “As the EU’s largest economy, it is not surprising that Germany has lost most in terms of financial totals.

       “If an EU country sells more, it loses more if there is a trend away from buying from EU countries.

       “The actual totals in pounds can therefore disguise the impact on individual countries.”