“At one stage, in the mid-90s, he disappeared so completely that rumours swept around London that he had died, perhaps of Aids, perhaps of drugs.” It turned out that he was holed up in his mother’s house, battling addiction and demons. Clark “came back in the early Noughties … [and from] 2005-7 he was artistic associate at the Barbican and developed three new Stravinsky ballets.” Now he’s back at Edinburgh after 21 years.