separate campaign group to deliberately spend more than the authorized campaign limit. >> in effect they overspend and not just by small amounts, by 2-thirds of a million pounds they overspent and the impact of that, the difference between -- the difference between that was just a few percentage points and that makes all the difference and it wasn't legal. >> the majority of that money allegedly went to the canadian data firm called aggregate iq. they have been linked to cambridge analytica. they were accused of using facebook user data to target voters. >> they cheated and people were lied to and the referendum wasn't legitimate.