Your best bet is to take a punt on GunTrader. It’s about £7.50 for a standard add with pictures . If you have an idea of value ( realistic ) you will end up 30% better off than sticking it in an auction or trading it in . Shotguns are no different to used cars , if you are offered a great trade in by a dealer , it’s because you are overpaying on the item you want to buy . Take your revolver out of the deal and you can probably negotiate a discount depending on the gun. I was very pleased how quickly I sold a gun on GT recently and very pleased with the price I got , as I could offer it a a better price than traders so the buyer was happy as well .