Boris Johnson was also asked about speculation that he might be offered the Conservative Party Chairmanship ahead of the general election. He replied:
"Nobody has offered me any such role. The most important thing I have to do is run this city and I'm not aware of any plans to make me any such offer. I've got to get on with being mayor."
More top news
Londoners who have received new electronic gadgets for Christmas are being advised to take simple steps to protect them from thieves.
The Boxing Day sales got off to a flying start with shops reporting a surge in business during the first hour of trading.
Bus strikes are planned for Monday 29 December and Monday 5 January.