Madonna, drugs and helicopter-trained dogs

The dark, starry life of William Orbit. He was a techno-classical genius, famous for producing smash hits for Prince and Britney Spears, amongst many others. Then he was sectioned in his 60s after a drug-induced breakdown. Now he's back with new music and a new lease of life. Here, the superproducer explains to Kate Hutchinson how he managed to come back around.