If you look at London it is predominately Labour. Corbyn isn't Labour. He is a communist and it would have taken this country back to the 70's but without decent music.
I passed my driving test in Blyth so was delighted when they voted for Levy as their MP.
I think you should look to what happened with Labour and why they were deserted by their core supporters couldn't stomach voting for a London-centric labour party.
BJ was a good mayor and could well turn out to be a good PM. Not that you will ever admit it.