Being in London

Hey not sure if this is the place for this but I couldn't find where else to put it. I'm currently in London for work, and my bf is joining me here next week. We don't know anyone but it would be nice to go out to a club or bar and have some people to hang out with. Aside from hanging out if anyone can recommend some good clubs/bars that would be awesome too. I'm 24 and my bf is 19 so prefer something with a younger crowd. We are NOT looking for a hook-up/threesome (sorry to disappoint :P).