Not terribly useful for me, but here is a list of restaurants where you can eat under $10 in New York. It’s been making me hungry, reading through the descriptions of all 100 mostly family-run restaurants/joints… Now if only someone could do this for London.
Found through Paul.
that canadian girl 
Steve
Man what a great site!
I could probably think of quite a few places in London for less then £10 food & a drink!