There are laws pertaining to the use and carriage of fireworks in the UK. You'll find them roughly outlined here. Local councils may have additional restrictions and there has been pressure to restrict nationally to licensed displays and religious or traditional celebrations only.

Walrus: fireworks now spread over October and November because there are a couple of religious festivals that fall often around this time. In the middle of October we had Eid - roughly described as the Muslim Easter, and this Friday we have Diwali - the Hindi festival of Light. Both are celebrated in many areas with lights, bright colours and fireworks.

LTS