SWNS.com Nigel Farage once the referendum result had become clear

A friend of Nigel Farage made a killing on the currency markets after he announced Leave had lost the EU referendum .

The UKIP leader “conceded defeat” just after 10pm on June 23 even though he had reportedly been told about polling saying Remain was on course to lose.

Mr Farage told Sky News immediately after the polls had closed: “It’s been an extraordinary campaign, turnout looks to be exceptionally high, and it looks like Remain will edge it.”

His comments had a dramatic impact on the markets and caused the pound to rise against the dollar.

According to a book on Brexit , All Out War by Tim Shipman, Mr Farage made his comments despite being privy to private polling that predicted Leave on course to victory.

Nigel Farage denies he knew about the shorting

A confidant of Mr Farage, Chris Bruni-Lowe, said he had told Mr Farage about the private exit poll.

He said it was his opinion that: “Nigel moved the market so much by doing that, that basically a lot of people got a lot of money.

“I don’t think it was on purpose. I think he genuinely didn’t believe what I was telling him.

“The market moved to such an extraordinary extent that some people made an astronomical sum of money on it.”

Speculators were able to cash in by “shorting” – betting that the pound would fall once the full result was known.

Among those to profit were Hermann Kelly, Mr Farage’s director of communications in Brussels, who according to Shipman’s book made £9,500 by shorting sterling against the dollar.

Farage denied his concession of defeat had helped his friends in the City. “No, no no. I wasn’t shorting it – I should have done,” he said.

UKIP aide Hermann Kelly says he backed the "best horse"

Mr Kelly said: "It’s quite normal for an owner to back or put money on a horse they have spent years training. Brexit was our best horse and cleared all the jumps."

He added: “Sterling had risen a lot on forex (the foreign exchange market) and I judged that, while it might go up a bit for a Remain vote, if there was a Brexit vote it would fall dramatically – as it did.

“I was not party to any hedge fund poll but listened to the experience of level-headed UKIP activists on the ground.”