just fyi,
sintra is actually a brand, not a type of plastic, Much like what COCA COLA is to "soda". Everyone else tries to replicate sintra, but in my experience, has always fallen short, much like RC is to Coke. You know both are colas, but one is obviously better. Your best bet would be to call Sintra or a distribution center for Sintra and ask them if they ship or if there are any UK distribution centers.