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Annabelle Fuller, a former Ukip aide, has labelled her former leader a “liar” and a “hypocrite”. In a damning interview, she claimed she was sleeping with Mr Farage from 2004 until October last year. However, the pair kept their relationship strictly professional between 2010 and 2012.

GETTY Nigel Farage has been accused of being a “liar” and a “hypocrite”

Ms Fuller explained: “Right from the beginning, lying about the affair was a strategy we decided on. “We had many conversations about it, even in the past couple of years. He told me I had to keep quiet. I said to him, 'Do you have any idea how painful it is for me?', and he would say 'Yes'. “Nigel and I both knew we had to keep quiet to save Brexit. We are both liars and hypocrites but the reason I had to lie throughout the years was that I didn't want Ukip or the cause we were fighting for to be damaged.

Nigel Farage in pictures Mon, April 3, 2017 Nigel Farage is a British politician who has been the leader of the UK Independence Party since October 2016. Play slideshow Getty 1 of 48 Nigel Farage in pictures

“He said, 'They will use anything they can to stop this, they will use anything they can to stop me. We are going up against the Establishment here. They will come after you.’” The pair were introduced when Nigel Farage was a Member of the European Parliament and Ms Fuller had started working as a Ukip parliamentary research having just completed a master's degree in international relations. Mr Farage, who married his now estranged German-born wife Kirsten in 1999, reportedly told Ms Fuller that it was a marriage in name only.

Ms Fuller, in an interview with the Mail on Sunday, said: “He said that it was an unhappy relationship and had been for some time. He told me the marriage was not a real one.” One MEP, speaking anonymously, said: “It wasn't just a fling or a one-night stand – he was thinking about leaving his wife for her. I have spoken to Nigel about the relationship in the past and know Annabelle and Nigel were still involved sexually until late last year.

GETTY Nigel Farage has himself in the past spoken about the “betrayal” of family values in British society