Tomorrow is the 40th anniversary of the death of T. Rex frontman Marc Bolan, who was killed in a car crash in Barnes, London, a fortnight before his 30th birthday. This profile of Bolan, who during the course of his career wrote ten top-ten songs, four of which got to No. 1, covers the man who was a more complex figure than most people think. It features both extracts from Bolan\u2019s diaries, and unseen home movies made by Bolan and record producer Tony Visconti. Marc Bolan: Cosmic Dancer is on BBC Four at 21.00.