Where can I find statistics on drug abuse in the united kingdom?

Where can I find statistics on drug abuse in the united kingdom?
I’ve been searching for a little while, but not found anything (google, live, yahoo search). And, it doesn’t have to be the united kingdom, international is fine too. It’d like it to be on drugs like: LSD, Ecstasy, cannabis (marijuana) and substances like that. Please help if you know where to find them :).

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