It depends where and when. ie Intrepid Fox is 18+ only, but they only ID in the evening. World's End is 18+ and they ID during the day as well. If you're thinking anywhere after the shows though, forget it. Even Wetherspoons doesn't allow under 18's in after a certain time and it's basically a family orientated chain-pub.
Just gon' poke mah face in here for those who haven't seen me in the hangout yet :>
I shall be staying in clink78 in the 10 bed dorm and will be up for SO many beers EVERY night.
I like beer.