Northern talk v London talk: that is something worth a very serious scientific research. :) People in the North tend to talk differently from the Londoners, and it's not just a matter of accent.

What I haven't heard since moving to London:
- ta (instead of thanks or thank you)
- easy peasy
- pants (instead of trousers)
- dinner (instead of lunch) and tea (instead of dinner)
- brew (for tea - drink)

What the Londoners seem to use far less than the Northerners:
- fair enough
- cheers

What the Londoners say and the Northerner would never say:
- pudding (meaing dessert - it was explained to me that it comes from posh boarding schools - so an institution poor Northerners don't even think of attending)

I think there are more words / expressions to follow. :)