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Nigel Farage's Brexit Party has been told to check all £2.5 million donated to it to ensure it hasn't accepted cash from foreign donors.

The Party will be required to satisfy itself that every single £25 'supporter' fee was not from an impermissible source.

If they can't, they'll have to either return it to the donor or hand it over to the Treasury.

The Electoral Commission last week confirmed the party’s online payment system put them at ‘high and ongoing risk’ of allowing overseas cash to be donated.

It came after a Mirror investigation found loopholes on the party’s website which could allow foreign money to pour into the party without being traceable.

And Parliament's Digital, Culture, Media and Sport Committee today published the full details of their investigation and recommendations made to the party.

The first recommendation, marked "High Risk – to be implemented as soon as possible", is to review all payments, including those of £500 or below, to ensure all of it is from permissible donors.

If the party has accepted such donations, they must be returned and reported to the Electoral Commission.

(Image: REUTERS)

Nigel Farage has said that the majority of the party's funding has come from individual 'supporter' fees of £25 a time.

But parties are only required to collect information on the source of donations over £500, so there’s no way of knowing whether someone has done that using PayPal.

And there are no regulations at all governing cash given to political parties as “membership fees”, such as the £25 payment to register as a Brexit Party supporter.

The Commission also recommended the party revamp its online system to require donors to provide addresses and contact details and only accept payments from cards that match the payer’s address.

And it suggested removing the site's £500 cap on online donations because it "may encourage those who want to make a payment in excess of £500 to make multiple payments, which the Party has to monitor, identify and check for permissibility."

The report also include a lower-risk recommendation to separate the £25 supporter fees from other donations. This should be in place, the Commission say, within six months.

The Commission said they were "concerned" that the party had no written procedures for accepting the £25 supporter fees, "given that the Party’s existing funding model is based around the receipt of such payments."

The Electoral Commission's Louise Edwards told the DCMS Committee: “They need to go back and look at the payments they have received, over or under £500, and they need to satisfy themselves that they are sure those amounts of money are permissible. And if they are not, they need to forfeit those amounts of money.”

She added: "It’s for the party to satisfy themselves of that - and we’ll be watching them do that work"

Electoral Commission Chief Exec Bob Posner told the Committee that any money that the party couldn't be sure is permissible should be returned - and any money that could not be returned would be handed to the Treasury.

A spokesperson for the Brexit Party said they would be implementing the recommendations in full "to the best of our ability."