I am meeting my friend in London stupidly early at Waterloo station. We are both country bumpkins and have no idea what to do with ourselves At some point we need to get to Tate Britain as I am meeting my friend who works there and I haven't seen her in years so a good couple of hours there. We have from 9am to 8pm. What else should we try and squeeze in? Where is good (and cheap!) to eat? I think it is mainly galleries we are going to try and get to. Is the Saatchi any good? I fancy the British museum but don't fancy our chances getting round it all. What would you recommend?