London is very expensive. To make the most of your time here eat McDonalds and fill up on Apple pies and stuff. the prices are fixed so you can have a meal for about six pounds sterling. I have been charged £5 for a slice of pizza before now.
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Go to Stockpot on Old Compton St, near Shaftesbury Avenue. Cheap and nutritious. Or go to any branch of Wagamama (www.wagamama.com) and get a large bowl of healthy noodles and veg, with juice drink for the price of a mac, coke and fries.
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Firstly, there's the new mini chain Leon, which offers cheap, healthy fast food. There are branches on Carnaby Street and at Ludgate near St Paul's, with more branches planned.
More details here:
www.leonrestaurants.co.uk/index.htm
And if you're near Covent Garden, Food for Thought on Neal Street is hard to beat - it gets busy, but it's worth the wait.