One morning, at the end of a drinking binge, I’d spent all my money, maxed out my credit cards, it was hot outside, but I couldn’t face going back to see my girlfriend or family to get some rest,” says Andrew, a 43-year-old business executive. “So I went to my car parked in the underground parking lot, but realised I couldn’t drive as I could barely walk. I sat there, wanting to be alone and isolate myself from everyone and everything.