With just a couple of days its pretty hard especially if you have to fit business in too!
I am in the country at the moment enjoying fresh air and sunshine (well until it all went to sh*t today). A shame you are only there for another couple of days, otherwise I would have happily taken you to some den of iniquity
Gilligullu's suggestions are good (as are Mr Ed's). London really does have a lot going for it.