My experience isn't over yet, but there is nothing Wilkinsons can do to redress the balance. Ordered and paid for a Sigma 100-400mm Nikon fit lens and USB Dock. They arrived yesterday 6/4/23 and everything looked good until I tried to mount the lens on my D750, only to discover the lens they have sent me was a Canon fit. The Sigma USB on the other hand was the correct Nikon fit. The consequences of trying to mount a Canon lens on my Nikon Body could have resulted in costly damage to both the D750 and indeed the lens. They have none in stock as we speak, which means I have no chance of getting the lens I want, without a wait. I'll be asking for my money back and expect them to arrange collection of the Canon fit lens.