Mike Nattrass has confirmed, in the Sunday Mirror, recent allegations concerning Farage and Annabelle Fuller.
Mr Nattrass’ revelations about life inside UKIP come days after Farage found himself at the centre of explosive allegations about his private life.
Former UKIP MEP Nikki Sinclaire stood up in the European Parliament on Wednesday to ask why he was paying a salary to former “mistress” Annabelle Fuller, a party aide.
Father of four Farage has denied she is his mistress but Mr Nattrass, deputy leader from 2002 to 2006, claimed the pair have been close for ten years.
He said the friendship between Farage – married to Kirsten Mehr since 1999 – and Miss Fuller was “an open secret” in the party, which is on course to top the poll in May’s Euro elections, pushing the Tories into third place.
Mr Nattrass said: “In 2004 she was my assistant – she was landed on me. I didn’t know why at the time. “She became my assistant in Brussels and Strasbourg and, frankly, she was of no use to me and I couldn’t understand why I’d got her. I complained I didn’t want her and eventually she was transferred away.”
The former chartered surveyor, 68, added: “She used to go strutting about saying, ‘I will be the next Mrs Farage’.
“Nigel has got a reputation for women anyway. She was caught sitting on his knee a number of times in the office.”
Another insider told the Mirror how Farage and second wife Kirsten were in a hotel room at a party conference when Miss Fuller knocked. Mrs Farage told the young aide “where to get off”, it was alleged.
The source said: “Kirsten wasn’t supposed to be there and Annabelle comes knocking. Kirsten opens the door and pretty much chases Annabelle away.”
Mrs Farage was asked last September about her husband’s alleged affair with Miss Fuller. She replied: “I don’t think so – ask him that.”
Farage’s friend and former UKIP MEP Godfrey Bloom, who shared a Brussels flat with him for several years, has admitted his pal was “partial to crumpet".