'It's part of who I am, but doesn't define me' - Mark's battle with depression

Soap actress Beverley Callard - best known as Liz McDonald from Coronation Street - has opened up about suffering from depression. She has battled recurring bouts of clinical depression for years, admitting to the Sunday Mirror at the weekend she has been feeling so low that she felt suicidal. It's something that Mark Kelly from Derry knows all about. I've been speaking to him about his own fight against depression and I began by asking him to take me back to the beginning and when he first realised when things weren't just quite right.