"The words are just so important, and just so sad" - Helen Gray discusses a song her son loved

Private Chris Gray was killed by a Taliban fighter in Afghanistan in 2007, aged just 19. His mum Helen talks to Jeremy Vine about why Chasing Cars by Snow Patrol means so much to her, even though she can no longer listen to it. Part of Songs My Son Loved, a series speaking to the mothers of soldiers who have died in conflict.