Only 1 in 5 White Brits now vote LabourWatch
White Brits voting for Labour is like Jewish people voting for the Nazis.
London is a highly divided city, both racially and along class lines, so it will all be down to where you draw the lines on the map - the outer suburban areas are overwhelmingly Tory, apart from a few LibDem areas, which will probably go Tory at the next election. Go a little further out and you have white working class people swinging one way and then the other in different elections. Inside the circular road, there is a non-British majority and they tend to vote Labour.