There was no question of a really serious long-term option of prescribing forever... That's something were actually trying to stop... Because all over London there were these geriatric junkies to put it very rudely, people who had been prescribed out of the Sixties... a rump of people who have just never changed... So, rather than again give these people in London, the London Harley Street stuff, [the private prescribers] a kind of green light to go on prescribing forever, we decided to have it self-limiting . . . And, of course there were three-month and six-month so-called detoxifications, which we did use in Newcastle. And, I mean they were reasonably successful but of course this was all anecdotal.