Lennon

"He came in the first day and trained. I had a chat with him and said 'enjoy yourself here because I don't think you'll be here long'," then manager Neil Lennon recalls.

"In some ways, you stick a wig and a beard on someone, little round granny glasses and a white suit and everyone goes, 'It's John Lennon'"

Structured around the only full-length concert Lennon performed after the Beatles’ dissolution, the documentary peaks with sequences from that benefit show, called One to One, which took place Aug. 30, 1972, at Madison Square Garden.

On the one hand, Leslie provides elegant readings of a host of Lennon and McCartney classics.

Dickinson, who will play John Lennon in the films, will also be making a directing debut at Cannes.