The challenge comes after Mr Johnson described suggestions that he had banned bagpipes in London as "total tripe" during a visit to Enfield as part of the Conservative election campaign.
|Sir Norman Wrassle|
"The Mayor of London is a serial offender. This is at least the third time in the last two years he has used the word tripe in a negative context. It's time he put up or shut up," he said.
Sir Norman, who was the 1959 North West Lancashire Junior Lightweight Boxing Champion, said he would be equally happy to debate with Mr Johnson on a radio station of his choice. "This is a red line issue as far as tripe is concerned," he said.
Mayor must stop denigrating tripe
Boris challenged to withdraw tripe slur