Unfortunately so - if you’re under 18 you can’t legally buy them - but take a guess how well that works in practice 😉
https://www.gov.uk/fireworks-the-law & https://en.wikipedia.org/wiki/Fireworks_law_in_the_United_Kingdom
People still let them off after 11pm too - a bit annoying if you have pets, kids or on shifts, or for those who have animals on farmland nearby etc.
Category 3 fireworks (often referred to as display fireworks) are meant to be for organised displays only - but doesn’t really work out like that either.
Cat 4 (professional fireworks) are harder to get hold of - and carry more sever punishment (the police will take mis-use with these seriously) - as it’s difficult to prove you are entitled to have them in your possession if not at an organised show.
The Fire Brigade and the NHS don’t really like fireworks either - weekends are busy enough for them as it is - let alone more people being injured through fireworks and idiots mis-using them.