Try Mike Noble. His prices are fair.
mjnoble.co.uk
http://www.mjnoble.co.uk/catalogue.asp
Anything obsolete calibre. I've got a very nice 7 bore wildfowling piece hanging in my kitchen.
I had a couple of the martinis with silver work. Sold them at holts a couple of years ago. Not expensive at all, mine fetched about 200 each.
Dave
Smell my cheese
Could well be a few at Kempton....