"This thoughtful, troubling film from Don Letts shows how a joyful movement became hijacked by thugs and bigots. To the point where even the title of this programme will be off-putting to some. But the precursor to all the hooliganism was a teen obsession with Jamaican ska. Kevin Rowland recalls, 'We saw the Pioneers, we saw Desmond Dekker and we loved them. It was completely multiracial.' And Letts is at pains to celebrate both the fashion before the fascism – reflected in increasingly ugly 70s archive – and the style revival."