Paul McCartney has tweaked his backstory regarding 'A Day In The Life', claiming that it was himself who penned the lyrics rather than John Lennon.

The former Beatle bassist/vocalist previously said that the Sgt Pepper’s Lonely Hearts Club Band (1967) song was inspired by a drugged-up politician who “blew his mind out in a car”.

His bandmate Lennon later contradicted him, remarking that the car crash that killed 21-year-old Guinness heir Tara Browne in 1966 influenced the words.

McCartney has since clarified in his forthcoming book The Lyrics that the words are about Browne, whom he counted as a friend. He also told The Telegraph that he wrote the lyrics instead of John Lennon - as had been previously believed.

The book is set to be released on Tuesday (November 2). In the project, McCartney says of Browne: “I wrote about him in 'A Day in the Life': ‘He blew his mind in a car/he didn’t notice that the lights had changed.’”

Previously, McCartney wrote in a 1997 biography Many Years From Now that song wasn't inspired by Browne.

"The lyrics have been attributed to Tara Browne, the Guinness heir, which I don’t believe is the case. In my head I was imagining a politician bombed out on drugs who’d stopped at some traffic lights and didn’t notice that the lights had changed”.

The Lyrics has been described by McCartney as being “as close to an autobiography” as he is likely to write and is expected to tell stories about the 154 songs that he has written.