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Millionaire Leave.EU founder Arron Banks has apparently taken a lie detector test in a bid to prove he did not accept Russian funding for the Brexit campaign.

The man who bankrolled the campaign to leave the EU announced on Twitter he was taking a polygraph test following a slew of accusations.

The test, which is widely discredited and not admissible as evidence in UK courts, saw Mr Banks asked three times whether he accepted Russian funding for the Leave.EU campaign.

In the stunt he answered no to all three questions – each worded slightly differently – and each time the test suggested he was telling the truth, according to the Westmonster blog launched by Mr Banks.

It claimed the test found there was “no deception indicated”.

Mr Banks hailed his own success on Twitter, writing that he “passed with flying colours”, before calling on former Labour spin doctor and staunch Remainer Alastair Campbell to take one.

Mr Campbell, who had questioned the validity of the test, responded that five inquiries had investigated his time in Government under Tony Blair and he had been “cleared by all”.

Mr Banks responded: “I’m happy to replicate the test with an independently appointed expert perhaps you would like to join me.

“The public would love a few answers from you , Campbell...”

Insurance magnate Mr Banks has previously admitted to a parliamentary inquiry into fake news that he wasn’t averse to leading voters “up the garden path” over Brexit.

He and the organisation’s communications chief Andy Wigmore were grilled by MPs in June over the conduct of their campaign in the 2016 EU referendum.

Mr Banks said he had to use “alternative methods” to “punch home his message” because the Remain campaign was outspending them.