Kirsty Young's castaway is Baroness Sheila Hollins.An Emeritus Professor of Psychiatry, she has specialised in the health and welfare of people with learning disabilities; advising on policy and influencing attitudes. She started off as a GP, turning to psychiatry after finding a huge proportion of her patients were suffering from emotional and social problems. One of her four children has a learning disability and that has brought a focus to her professional ambitions. She says: "In many ways, I've always thought that our children are going to be different to any expectation we had of them and really the joy of parenthood is discovering who your children really are."Producer: Leanne Buckle.