Not for housing, I'm sure they're crazy but for food and drink. I'm a northerner and just spent a couple of days in London. Obviously I have been to London before but I think because I'm on my own this time I've noticed prices more than usual. And they're pretty much the same as any northern city.
I'm surprised because people always go on about how expensive London is but some places actually seem cheaper than my local big city. Maybe bars and restaurants in the north have just got really dear!
I also don't get the thing about London being unfriendly but that's probably a different thread!