Johnson added that he was "perfectly within his rights to have a bash at me" after he was quizzed about being fired from The Times for making up a quote while working as a journalist.

BBC: Eddie Mair interviews London mayor Boris Johnson

"If it's possible to source the raw ingredients for a mobile phone - and I am not talking anything to rival Apple - I'll certainly have a good bash, " he says.

BBC: Can a family survive for a year on British-made goods?