If people say that London won't have a Tory Mayor for some time because of the political make up of the capital, think about Boris Johnson's reign as Mayor from 2008 to 2016.
From:
http://eprints.lse.ac.uk/63374/1/Kockan_London_Government_50_Years_of_Debate.pdf
//The 2008 mayoral election was a battle to the death, squeezing the Liberal Democrats badly. In the end and with second preference votes taken into account, Johnson beat Livingstone by 53% to 47%//
//This was a comfortable margin in a two- horse race. While Livingstone could reasonably point to the Labour Party’s unpopu- larity in the parallel local elections//