Sir Paul McCartney and Yoko Ono are both said to be furious about a book which makes controversial claims about John Lennon.

Sir Paul and Ono, Lennon's widow, are both understood to have contributed to the biography, which claims Lennon wanted a gay relationship with Sir Paul.

John Lennon: The Life also suggests that Lennon fantasised about having a sexual relationship with his mother.

The biography has been written by the Beatles author Philip Norman.

“Both Sir Paul and Yoko are extremely angry and upset,” a source told the Sun newspaper.

(by Jason Gregory)