My buddy and I are coming to London in mid-December from Los Angeles and San Francisco, respectively, to celebrate our 45th birthdays by attending the Led Zeppelin reunion concert at the O2 Arena and staying for several days afterwards. We are both foodies and wine collectors and regularly eat at great restaurants all over the US and we are looking for recommendations of fun, hip places in London. We are not seeking the "best food" or any particular types of food. We are looking for places that are popular, loud, social and fun that will give us a chance to enjoy London. I've read many postings of the London locals and I would especially like their advice. Thanks.