This video has been amended to remove inaccuracies and some personal information

Shahmir Sanni, who worked for the official Vote Leave campaign, today breaks cover to raise concerns that the group behind the knife-edge 2016 vote in favour of Brexit – including key figures now working for Theresa May in Downing Street – may have broken the law by flouting referendum spending rules and then attempting to destroy evidence.

Sanni claims that a donation of £625,000 was made by Vote Leave to an independent referendum campaign organisation called BeLeave. Sanni says that the money, which was then channeled to a Canadian digital services firm, AggregateIQ, that has links to the controversial Cambridge Analytica, violated election regulations. The donation was sanctioned by the most senior figures in Vote Leave, including campaign director Dominic Cummings and CEO Matthew Elliott

Cambridge Analytica whistleblower: 'We spent $1m harvesting millions of Facebook profiles' – video