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A Remain-backing campaign group has been rapped for failing to properly declare £51,000 it spent on a video campaign during the EU referendum.

It comes after the official Brexit campaign was fined and reported to the police for not properly declaring £680,000 worth of joint spending.

The Wake Up And Vote (WUAV) group ran the “5 seconds” video campaign alongside another group, DDB UK.

The video campaign featured Love Actually star Keira Knightley.

While a donation of £24,000 from WUAV to DDB UK relating to the campaign was properly reported, the Electoral Commission ruled WUAV should have declared the £51,812.90 spent by DDB UK, as it was “joint” or “common plan” spending.

WUAV have been fined £1,800.

(Image: Getty Images)

The official Vote Leave campaign is still under police investigation over a similar, but much larger, allegation of undeclared joint spending.

The group were fined £61,000 and referred to the police over a £680,000 donation made to BeLeave, a youth focused campaign group.

The Electoral Commission - which regulates political parties, members and campaigners - found that BeLeave "spent more than £675,000 with (Canadian data firm) Aggregate IQ under a common plan with Vote Leave", which should have been declared by the latter but was not.

If Vote Leave had properly declared the spending, they would have broken the legal limit of £7 million by almost £500,000.

Louise Edwards, the Commission’s Director of Regulation said: “Permitted participants at the 2016 EU referendum were required to provide accurate reports of their campaign spending. This was so the public could see where they got the money for their campaign, and how the money they used for campaigning was spent.

“Both Wake Up and Vote and DDB UK Limited had an important legal duty to accurately declare joint spending in their referendum spending returns. Both failed to do so, meaning that voters, looking at the reported spending, had no way of knowing that WUAV and DDB UK Limited had worked together on a campaign, or of how much either campaigner spent in total.”

DDB UK was fined £1,000 in March 2018 for other inaccuracies in its spending return.

The Commission noted: "We cannot, by law, impose a further penalty for this same offence".