I just checked and it doesn't look like it, unless they're called something else. Lots of youtube videos showing them bunged together to make bombs etc though...
By the way, I'm happy to invest £20 in membership if that'd help. Expert advice all very useful. Meanwhile I'm going to buy a pack of indoor sparklers and try some things out.
it all sounds possible and interesting. I'd really like to try some of these out. Any local groups I could visit? Happy to pay for membership if it's not too expensive. I'd rather get the help of someone who knows the materials in the first instance...