Pink Floyd's David Gilmour: 'How I got involved with the inspiring Liberty Choir'

Wandsworth Prison is not a place I ever thought I would willingly return to. I was last there four years ago, visiting my son Charlie, who had just been given 16 months for violent disorder following the university fees protests. Whether they deserve to be there or not, seeing your child in a prison grey tracksuit is not something I would recommend to any parent. It was a deeply depressing experience.