I'd recommend Dig (Small Bore) from personal experience. Don't miss the auction - it is a fun day. Take the tube from where you are staying to Hammersmith station. Holt's is about 3 blocks to the right from the station entry - you can almost see it. The folks there are friendly. However, note that the auction moves righ along - does it ever!! You absolutely must have your mind made up as to what you will bid and not dwaddle over price - they don't try to "milk" the last £ out of each lot, they mean it when they pause over the last bid. Viewing and sales are in differing parts of the building. Lots are shown via video in the auction room. Viewing and bidding on early lots is a bit of a problem if you don't arrive well before the auction starts. Even if you don't buy anything, it is fun to see all the guns and stuff in one place. Dig's prices are most reasonable for the services rendeded. Oh, and did I say he knows his guns?