Brodies has a Central London pub in The Old Coffee House so they may well have a few of the specials on offer. Close-ish to Oxford Circus or Piccadilly Circus, so can't really be conveniently added to any of your groups, unfortunately. Brodies is a regular at The Old Fountain, however, so you may strike lucky there, but this is a pub that is usually closed on weekends, so bear that in mind.
Enjoy your trip - I'll be at Craft next Thursday and am thoroughly looking forward to it (although I'm a little concerned at the likely bank balance hit!).