Not British, but as a kid we used to celebrate Guy Fawkes day with fireworks.
Could buy large boxes of powerful fireworks at local convenience stores and corner shops.
Had no idea what it was about really, just an excuse to burn Catherine wheels, shoot rockets, see things explode in the sky, light up sprinklers and throw poppers around. Usually with zero parental supervision.
Seems no one celebrates in anymore, didn't hear a single firework.
But 35 years ago it was considered a lot of fun.