Still quite the novelty where I live as somewhat understandably they were illegal during The Troubles. So while they have been available legally for well over a decade they are still "a thing".
They are used in NI at Halloween - a week earlier than in England when they seem to be used on 5th Nov.
Need a licence for them here - £30 - and you have to state what you are buying, when you are using them and from whom you are buying them.
Was looking at what is available at my local purveyor and amongst the selection of rockets etc. are these items called cakes. They appear to be mini displays in a box - light the touch paper and stand back. Seems to be a bit of a gamble (some cost over £100). Anyone try one of these?