OFFICIAL leave supporters may have broken the law in their pursuit of Brexit, according to QCs who have spoken to a third campaign whistleblower.

Helen Mountfield QC and Clare Montgomery QC of Matrix Chambers, said, having read through leaked paperwork, and taken testimony, they believe that “there would be realistic prospects of conviction”.

Over the weekend, there were claims Vote Leave may had flouted strict electoral commission referendum spending rules by effectively funnelling cash into BeLeave, a smaller organisation that seemingly did whatever was asked of it.

Vote Leave denies the claims.

The QCs have sent a 46-page document examining payments made by Vote Leave during the EU referendum to the Electoral Commission, asking them to investigate.

They say: “In our opinion, the extensive grounds for suspicion of the commission of offences under PPERA [Political Parties, Elections and Referendums Act 2000] are sufficiently strong, and the potential offences sufficiently serious, that there is a good case for the exercise by the commission of its investigative powers.”

One of the whistleblowers, Shahmir Sanni, who helped run BeLeave, said he believed the result of the 2016 vote was now tainted.

“They take away your medal if you are caught cheating at the Olympics,” he told reporters.