Go to Antique Guns at the related link and describe your firearm in as much detail as possible (and in the correct category or a couple of them will give you a hard time). The people there will give you an estimate of the value and help you determine if you really need a professional appraisal, and if so, guide you in the right direction.
There are several specialized auctions houses in the U.K. (and the U.S.) and other general auctioneers like Christie's and Sotheby's who have specialized arms auctions from time to time. They will freely advise you as to what you might expect if you put your item up for sale. Fees can be high, however. You might also try one of the U.K.'s best antiques arms dealers, Peter Finer, who I can wholly recommend as being fair in his dealings. However, he only buys and stocks the finest examples.
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