Boris for mayor of London? Even disregarding his Toryness, I don’t think so.
(1) I cannot conceive that the Tories would ever dream of putting up as mayoral candidate a serial adulterer whose nickname rhymes with ‘ozza’.
(2) Boris is very much like the Queen: a much-loved national institution, but you wouldn’t want him to have any real power. (The analogy breaks down, though, as he doesn’t need a spouse to supply right-wing views and tactless comments.)