A chap in Kent has recently been successfully prosecuted by the CG for firing flares at a party.
He apparently rang the ops room to ask permission and gave his details and address. When he was told he couldn't fire them unless in a distress situation at sea, he retorted that he was going to fire them anyway (the conversation was recorded).
Upon firing them at his party, it generated a couple of 999 calls from concerned persons.
He was then issued with a summons to appear at court by CG.
At his court case he admitted the offence, under I think the misuse of explosives act, or some firearms offences - will check up on that and correct where appropriate.
It looks as if some areas will prosecute, whilst others will not.
Its a pity because a lot of our calls in this area are flare sightings, esp in winter.