Sir Paul McCartney's unreleased collaboration with former Beatles bandmate Sir Ringo Starr ...

An unheard track by Sir Paul McCartney and Sir Ringo Starr recorded after the Beatles split is heading for auction.

Angel In Disguise could be the only song co-written exclusively by the band’s former bassist and drummer, according to auctioneers.

The ex-Beatles recorded the demo for Sir Ringo’s 1992 solo album Time Takes Time but it did not make the cut.

Former Radio Luxembourg DJ Tony Prince is selling the cassette, which is expected to fetch up to £20,000.

He was asked to find artists to record alternative versions of Angel In Disguise in the 1990s, after Sir Ringo rejected the track.

The song has never been heard publicly.