Itís probably getting worse than it has been recently but I remember it being quite bad 20-30 years ago.
I canít speak for anywhere else but all over the South and West of Edinburgh, huge pyres were allowed to develop over a matter of days. Huge piles of combustible material like mattresses, pallets etc...were piled up all over the place and I canít really imagine that sort of thing happening nowadays.
These huge fires always attracted a big crowd but chaos would undoubtedly ensue, resulting in attacks on fire crews, random firework incidents and general yobbish behaviour.
Maybe itís getting that way again.