Hmmm, 119 posts and asking about buying powder !
He said I needed a reason to buy , I replied that "it wasn't for use in a fire arm but in model rocketry so I didn't think I needed a certificate"
So what do you actually want it for?
I would suggest you ask members of your club where they get theirs.
“If a cricketer, for instance, suddenly decided to go into a school and batter a lot of people to death with a cricket bat, which he could do very easily, I mean, are you going to ban cricket bats?” :- Prince Philip said after Dunblane