How much would it cost to live in London for 4 months?

Impossible to answer. It depends where in London. For example, rent is more expensive in central than it is in north west.

ok please tell me for all different regions of london - N, S, E, W, NW, NE, SW, SE and central.

I'd like to know approximately how much it would cost to live in London for 4 months. I am having an argument with my dad about this. He says it would cost at least £10,000 and thinks I am a 'complete fool' to think it would cost any less than that. I keep saying that £10,000 is far too much (most graduate salaries barely cover that) and £5,000 is a more realistic figure.