London Mayor Boris Johnson is alleged to have launched a tirade of f word abuse at Keith Vaz, the Labour chairman of the Commons home affairs committee.
The two clashed in a phone conversation after Mr Johnson gave evidence to the committee about a Tory MP's arrest.
Committee members say they were shown a transcript by Mr Vaz suggesting "the mayor used the F-word 10 times".
Mr Johnson's aides deny that he swore so many times, instead saying that he "once or twice used a term for a type of confectionery which is usually very sweet, extremely rich and sometimes flavored with cocoa. It is made by mixing sugar, butter, and milk and heating it to the soft-ball stage at 240 °F (116 °C), and then beating the mixture while it cools so that it acquires a smooth, creamy consistency.".
We can reveal the transcript of the telephone conversation.
BJ: Vaz, it's Boris.
KV: Boris, how are you?
BJ: Good. I'm eating fudge. Do you like fudge?
KV:… er yes.
BJ: What type of fudge do you like best?
KV: …I'm sorry.
BJ: Just answer the question Vaz. Fudge, what type of fudge do you enjoy the most or is that too difficult a question to answer?
KV: err… I don't know. Vanilla?
BJ: Lightweight. That's not even fudge, it's a band from the 60's. The sort of fudge someone like you would love would be a shit fudge one like toffee. Now about this…
KV: What do you mean. "I would like"?
BJ: You have no idea about fudge and when pressed you grasp at a common misconception. In matter of fact I put to you that you have never eaten, swallowed or bit into a stick of fudge.
KV: Boris, the relevance of this in light of our meeting at the commitee earlier is what exactly?
BJ: …. your mum's a lezzer (phone hangs up)
Our source asked to remain unknown and we cannot sustanciate these claims.