I think you could get by pretty easily on 200 pounds a day, especially if you're sticking to pubs (or even fast food) for meals. I think I got by on quite a bit less than that both times I went to the UK. There are definitely things you can do to stretch your dollar. Take the Tube and get some kind of pass; go to grocery stores for snacks and the like instead of eating at restaurants all the time, etc. And there will probably be some days that you stay quite a bit under your 200, so some days you could afford to go over as well.
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