I've just had the St James Argentum catalogue through, and noticed that their buyers premium is now 24% + VAT, same as Noonans. Not sure if this has just happened or if they've had it a while, but I certainly didn't pay that when I last bought from them.
It's only 5% odd extra, but it's all getting a bit expensive now. They know they're shooting fish in a barrel, but how long before the fish get canny?