Why was the Leave campaign accused of cheating in the Brexit vote?

Analysis: Vote Leave and Leave.EU both breached strict spending limits during the EU referendum, Lizzy Buchan explains

Vote Leave was referred to the police last year for breaching campaign spending limits (Getty)

One of the long-running rows on both sides of the Brexit debate is whether the EU referendum campaign was conducted fairly.

From Vote Leave’s now discredited promise of sending £350m a week to the NHS, to warnings from Remain backers of a devastating economic crash that never came, both sides say voters were fed wild claims.

But was there more to it?