In the summer of 1981, when he was 13, Grant crashed a trail motorbike. Grant hadn't given this childhood memory much thought in the intervening years, but one hot August day ... he suddenly understood it as a clue to his dangerously unhealthy relationship with alcohol. The day before, a team of specialists at the Royal Devon and Exeter hospital had given him an intravenous infusion of ketamine, a dissociative hallucinogen, in common use as an anaesthetic since the 1970s, and more recently one of a group of psychedelic drugs being hailed as a silver bullet in the fight to save our ailing mental health. To date, more than 100 patients with conditions as diverse as depression, PTSD and addiction have been treated in research settings across the UK, using a radical new intervention that combines psychedelic drugs with talking therapy. What was once a fringe research interest has become the foundation of a new kind of healthcare, one that, for the first time in modern psychiatric history, purports to not only treat but actually cure mental ill health. Under its influence, Grant had an out-of-body experience he struggles to put into words. "It was like I was sinking deeper and deeper into myself," he says. "Then I became white… and I left my body. I was up on the ceiling, looking at myself, but I was just this white entity. I felt very serene and humbled; I finally understood my place in the universe, just a white speck of light, I wasn't the centre of everything and that was fine."