I don't live in the area, but Clerkenwell and Farringdon area have a decent amount clubs, bars and pubs. If you like Belgian beer, there is a place called Dovetail which I recommend a lot.
When you are here next weekend looking for a place, pick up a copy of Timeout London or even go online to timeout.com to see what Clerkenwell/Farringdon has in terms of nightlife.
bvamin