I called the police but they didn't seem particularly interested and said unless these thugs were aiming for a car, it may not even be a crime.
Wtaf? No wonder the crime rate's so high if police officers are this ignorant about the law.
It is an offence to let off a firework on the public highway and is punishable by a fine, either in the magistrates court or by an £80 FPN. Prosecutions used to be brought under the Explosives Act of 1875, but they may use more recent public order legislation.
In the county where I live, Nov 5th is a huge thing and fireworks and torchlit processions most weekends from 3rd week of September for 2 months. I used to be involved in it, and most weekends someone would get nicked, usually for doing something stupid and generally drink related. Even though I'm one of the most law-abiding people I know, and even I got a caution for letting off a firework in an empty pub car park (that copper didn't know what law I'd broken, tbh, but when I asked him, he told me that if I wanted to discuss the finer points of the law, I could do it at the local police station, and I didn't fancy trying to get the 30 miles home in the middle of the night).
One man I know got a £300 fine for letting a firework off in the street, so it's definitely illegal.
And it's dangerous. Even the smallest firework will have fuse wire in it, and I've known people get nasty eye injuries from a bit of flying fuse wire. Burns, small blast injuries and even bits of fingers blown off are relatively commonplace among the local bonfire fraternity, and one Nov 5th, someone in the crowd threw a firework that landed in my bra, but luckily I hoicked it out before it went off and only got small burns on the tips of my fingers.
Dangerous, stupid and definitely illegal. YANBU.