Sir Paul McCartney has revealed what he'd do if he had a time machine - and it wouldn't be going back to his Beatles' heyday.

Macca was asked where he'd go, if he could whiz back or forward in time, by a fan in Brazil.

And he replied, "Go back and spend time with my mum", the Daily Mail reported.

Sir Paul was just 14 when his mother Mary, a midwife, died at the age of 47 from an embolism following surgery to treat breast cancer.

He has previously told how his mother inspired the song Let It Be when she appeared to him in a dream.

"My mother appeared, and there was her face, completely clear, particularly her eyes, and she said to me very gently, very reassuringly 'let it be'," the star said.