There’s an old British saying, “In for a Penny, in for a Pound.”
If you’re going to break the law and own a gun, you might as well break it completely and go straight for the machine gun.
Now I have no idea what they mean when they say they found 60 “rounds” and 29 “cartridges.” Cartridge is the complete round including bullet, casing, primer, and powder. “Round” is a generic term meaning basically the same thing. Maybe they meant to say 60 live rounds and 29 spent shell casings.
No matter what they meant, two people got shot in the face with in allegedly gun free England.