Labour leader Ed Miliband has described Boris Johnson as a "good showman but not a very good mayor".
Speaking to ITV London, Mr Miliband said that while the London Mayor was a "fun guy" it was not enough to be a good Mayor.
However, the Labour leader insisted comedian Eddie Izzard - who has announced his intention to stand as London Mayor - was welcome to stand for Labour in the 2020 contest.
More top news
Pauline Cafferkey was flown in a military aircraft from Glasgow to London in the early hours of this morning.
The council said they have decided to postpone the cull until further notice.
Renting a property in the capital will work out to be more cost-effective than buying one, according to new figures