A what if.
The Firearms (Dangerous Air Weapons) Rules 1969:
Rule 2 (1)
Subject to paragraph (2) below, Rule 3 of these Rules applies to an air weapon (that is to say, an air rifle, air gun or air pistol)that has a missile, on being discharged from the muzzle of the weapon, kinetic energy in excess, in the case of an air pistol, of 6 ft. lb. or, in the case of an air weapon other than an air pistol, of 12 ft. lb.
Would solve a lot of our problems.
This could be changed by the Secretary of State for the Home Office.