By Jerry Thomas
The Politics Show, BBC London
The Mayor is a vocal defender of investment in London
Well, he's fallen in a river. He definitely waved the flag in Beijing.
But do Londoners know what Boris Johnson has actually achieved as Mayor?
Statistics suggest that his personal recognition ratings outstrip recognition for his achievements.
In a poll published recently 63% of people polled said that they were neither satisfied nor dissatisfied or had no opinion on the way the mayor was doing his job.
The same poll in 2007 showed only 33% (Greater London Authority survey 2010).
That might be set to change. In two weeks, the Mayor's bike hire scheme is launching.
6000 of them will be available for hire, meaning - in central London at least - we will have a daily, visible reminder of something the Mayor has achieved.
The Mayor is a vocal defender of investment in London, arguing against any potential cuts in infrastructure, policing and other services by the coalition government - particularly when it means cuts in his own budget.
He argues that he has already saved millions at City Hall, cutting waste and inefficiencies, meaning there is less fat to cut in the GLA than other parts of the state.
But despite whatever savings he might have made in places, overall his budget has in fact grown from £11.3bn in the year he became Mayor to £13.9bn for the current year.
So will his argument wash with the government?
The second half of Mayoralty will be defined by cuts. And the next two years could well turn out to be the most difficult for any Mayor, since the role was created, and either make or break Boris Johnson's reputation.