Leading a group of US teens (up to 13 now I think) and two teacher chaperones to England. First four nights we will be in London and looking for some ideas for affordable dinner spots - about 20 pounds for a dinner and drink (non-alcoholic) is the budget per person. Most likely will be breaking into smaller groups so restaurants do not need to accommodate 16 people all at once. Open to good Indian, Thai, French, Italian, traditional British food or whatever.
Looking for recommendations in the following areas...
Night 1 - Piccadilly Circus
Night 2 - Oxford Circus
Night 3 - Kings Cross
Night 4 - Westminster/London Eye
Thanks for the help!!!