LONDON (Reuters) - The London film festival closes on Thursday with the world premiere of "Nowhere Boy," about John Lennon's rebellious teenage years and his torrid relationship with his aunt and mother before the Beatles were formed.

The directorial debut of video artist Sam Taylor-Wood, the movie stars Aaron Johnson as an angry, confused Lennon who struggles to understand why his mother Julia left him with his aunt Mimi when he was a small boy.

The film plays on the contrast between his "buttoned-up," straight-laced aunt, played by Kristin Scott Thomas, and his fun-loving mother (Anne-Marie Duff) who encourages him to listen to rock'n'roll and teaches him the banjo.

Asked how reliable her account of the star's troubled youth was, Taylor-Wood told BBC Radio: