Sir Paul McCartney is plotting to return to the studio with producer Jeff Lynne and complete work on another John Lennon tune he and his Beatles bandmates gave up on while recording Free as a Bird for the group's Anthology project.

The rocker has fond memories of working with Lynne on the Beatles best of, but he regrets not challenging the late George Harrison over a forgotten track that featured Lennon's vocals.

He said, 'It's still rubbish!' 'OK then'

In the new Jeff Lynne documentary Mr Blue Sky, McCartney raves about Lynne as a producer and musician - and admits he is looking forward to returning to the studio with him.

He says, "There was another one (track) that we started working on but George went off it... We were like, 'No George, this is John'. He said, 'It's still rubbish!' 'OK then'."

"So that one (track) is still lingering around. I'm gonna nick in with Jeff and do it, finish it, one of these days."