GEORGE Galloway last night threatened legal action against a left-wing magazine after it claimed he was a Muslim and had converted at a secret ceremony in London.

The Respect MP for Bradford West, reportedly raised as a Roman Catholic in the Irish quarter of Dundee, strongly denied the suggestion he had converted to Islam at a secret ceremony more than a decade ago.

Jemima Khan, who became a Muslim ahead of her failed marriage to Pakistani cricketer Imran Khan, claimed in an article for the New Statesman she knew someone who had attended the "shahadah" conversion ceremony, attended by members of the Muslim Association of Great Britain, at a hotel in Kilburn.

Ms Khan, who interviewed the MP in his new constituency, starts the article: "George Galloway, MP for Bradford West, is a Muslim. Those close to him know this. The rest of the world, including his Muslim constituents, does not."

In her article, Ms Khan tells the former Glasgow MP she knows someone "who attended your shahadah" and asks: "So you converted?" He is quoted as replying: "I can't answer that. God knows who is a Muslim."

When being sworn in recently as an MP Mr Galloway chose to affirm rather than make the pledge on a religious text.

The 57-year-old is quoted as saying he affirmed because he had to take an oath of allegiance to the Queen and all her heirs and successors in which he did not believe. "I have no allegiance to any of them and I could not possibly swear such a thing on a holy book. So nothing else should be read into the affirmation."

Last night, the Respect backbencher responded to Ms Khan's article, saying it was littered with "deliberate falsehoods" and "schoolgirl howlers".

He said the reference to an alleged conversion ceremony was "totally untrue".

Mr Galloway added: "Moreover I told her it was fallacious when she put it to me. I have never attended any such ceremony in Kilburn, Karachi or Kathmandu."

However, the New Statesman responded by saying: "It is notable Galloway does not deny being a Muslim convert and he did not deny it when it was put to him at the time of the interview, which is on tape."