There are cheap ways to see and enjoy London. As the others have said, hostels are a cheap way to rest your head at night and getting a travelcard at a newsagents or tube station on your arrival should help you get around cheaply. Take the tube and bus everywhere but also be aware that in central London a lot of the places look far apart on the tube but lots are actually walking distance from each other. Ask the locals for advice on this (contrary to popular belief us Londoners aren't all rude!) Go to theatres in the West End on the night and ask if there are leftover tickets - usually much cheaper than booking in advance. Take advantage of all the free museums (particularly the Natural History Museum, which is great)... Wow, I didn't realise that I'd worked out so many ways to enjoy London cheaply! Hope you enjoy your trip over here.