In response to a recent tip there is no need to resort to McDonalds to eat at reasonable prices even in central London if you know where to look.
Many Italian and Spanish cafes have good lunch options at reasonable prices and can be found in sidestreets around central London especially Soho. Or, get the Time Out guide to eating in London and make a note of the cheap places!
There are good takeaway options from Chinatown, fresh fruit in Berwick Market (later in the day is cheapest), many cafes in the streets south of Warren Street station off Tottenham Court Road are cheapish and if you are really pushed, chain sandwich bars are a better bet than McDonalds!
If you want a flavour of traditional cheap London food look up a pie and mash shop or an old-style fish and chip shop. The cheapest and best takeaway food option in London is Brick Lane Beigel Bakery but it's not central.
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