I wonder when the last homicide or robbery was committed with a muzzle loader in the UK?

Muzzleloaders should be exempt from legal restrictions, given their low likelihood of criminal abuse.

However, it also seems to me that UK law also seems to try to anticipate and control intended legal use, at the time of sale, or at any point during possession.

Case in point: an original 1851 Colt revolver would be uncontrolled, if the purchaser / possessor intends it only for a curio or ornament: but Section 1, if he intends to shoot it at the range.