I'm pretty sure you do, I can't remember though (I usually buy multiple items when I shop and there's always a flash of the licence required, no overly memorable event). Also powder is classed as an explosive and, in addition to showing your licence, it goes into a register that you have to sign off on -
mauserand9mm is correct, primers require a licence these days. Only inert components( brass, bullets, wads, hulls etc) do not.
