Last week the Islamist militant group Isis released a recruiting video featuring three young British men. One of them was Reyaad Khan, a 20-year-old from Cardiff. The Guardian has obtained exclusive footage of an interview with Khan, filmed in 2010 before he left to fight in Syria. He argues the government wasted resources on "illegal wars" and said more money ought to be spent on young people to help prevent them being led down the "wrong path"