The “corrupt and illegal practices” of the Vote Leave campaign in the 2016 referendum undermine the validity of the decision to leave the EU, the high court has been told. Relying on findings made by the Electoral Commission about overspending by the pro-Brexit campaign, British people living in Europe have launched a legal case arguing the referendum result should in effect be set aside.

The official Vote Leave campaign spent more than £2.7m on targeting ads at specific groups of people on Facebook - helping it to win the 2016 EU referendum.

Brexit campaign group Vote Leave has been fined £61,000 and referred to the police after an Electoral Commission probe said it broke electoral law. / The watchdog said it exceeded its £7m spending limit by funnelling £675,315 through pro-Brexit youth group BeLeave.

A BBC Spotlight investigation into the man behind the DUP's record £435,000 donation during the EU referendum has uncovered a trail of illegal activity and foreign money.

The whistleblower at the heart of the scandal surrounding the main Brexit campaign has called for a police investigation into allegations that the group breached electoral spending rules.

A Brexit campaigner has told Channel 4 News that Vote Leave cheated in the 2016 referendum by over-spending.

A shadowy global operation involving big data, billionaire friends of Trump and the disparate forces of the Leave campaign influenced the result of the EU referendum. As Britain heads to the polls again, is our electoral process still fit for purpose?