Tom Anderson wrote:

Or, you know, the main opposition to Bojo the Clown could be from a party
other than Labour. Maybe even one which was in government more recently.

The Liberal Democrats are extremely weak in many parts of London with very
little organisation - in the local elections last weak they only put up 12
candidates for the 60 council seats here in Newham and couldn't field a
candidate for borough Mayor. They're further hampered by a structure that
gives too much campaign power to local parties and doesn't easily adapt for
the GLA elections - by a lot of accounts their effort in the last elections
was often hampered because different borough parties within the same
Assembly constituency were not co-ordinating well.