Sadly the UK's a little more cautious with it's gun laws than Michigan!
Though having said that, one can never guarantee that it's not - "I checked the bore, m'lud, honestly I did, and I swear I thought it was empty. My finger just slipped on the trigger, m'lud!"
Hell, even if it's empty, I'd love to see the look on some thieving scallie's face when he sees the muzzle of a jezail lined up on him!