Where's the cheapest place for artists to live in London now?

I'm moving to London this summer to do a MA painting and I've just started looking where I'd like to find somewhere to live. Can't afford anywhere I know to be arty like East London or Peckham, so I'm going to have to look a bit further afield. I'd love to be in an area with some sort of underground art scene, small galleries and other artists ideally (I'd be looking for a house share). So wondering, where do the poor artists who haven't fled to the coast live these days?