When Chris Wylie disclosed the inner workings of Cambridge Analytica and its massive data breach of 50 million Facebook accounts to manipulate public opinion it became an international story.

Frontline and Byline’s coverage of the unfolding story now continues, as new disturbing whistleblower evidence has come to light suggesting the 2016 Brexit referendum was won by cheating.

Shahmir Sanni, a whistleblower working for Vote Leave/BeLeave came forward with material evidence pointing to foul play.

The whistleblower evidence suggests senior Vote Leave staff members – including some now working in No.10 – may have broken campaign coordination rules and overspent to the tune of up to £1 million, on top of their already £7 million limit. That extra money could have bought billions of extra online adverts in the final days of the election. With a result so close, any such cheating could have made the difference.

Shahmir Sanni, spoke with Chris Wylie, the Cambridge Analytica whistleblower, and Byline’s Peter Jukes.