The Electoral Commission announces it is investigating the Tories and the Green Party relating to last May's elections.

Fines seen by some donors as ‘just the cost of doing business’, says electoral watchdog.

The UK’s Electoral Commission has published the results of a near nine-month-long investigation into Brexit referendum spending and has found that the official Vote Leave campaign broke the law by breaching election campaign spending limits.

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.

The EU referendum was won based on a corrupt campaign, but the courts can't void the result because the referendum only advisory, according to the barrister who took the government to court.

Judicial review dismisses attempt to have Electoral Commission ruling thrown out.

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.

Analysis finds adverts reached ‘tens of millions of people’ in crucial days after spending limit breached – enough to change the outcome. / It is “very likely” that the UK voted for Brexit because of illegal overspending by the Vote Leave campaign, according to an Oxford professor’s evidence to the High Court.