I know that Guns at KWG in Ashford, 01233 637717 stock Remington, CCI and RWS caps.
Also, Chris at C&Shoot in Folkestone, 01303 850354 has just taken all of the stock from Jim Robison who was an RFD who recently died. Jim was a bit of a specialist when it came to B/P and I know Chris is wanting to shift the stuff he got, so ther may be a bargain to be had.
Wilson and Wilson in Ramsgate used to....... as long as you can put with Peter's , it's always worth a trip there.