There has been a week of build-up for The Beatles' "final song", Now And Then. This 45-year-old song was written by John Lennon in 1978 and finally completed last year - 45 years after the first bars were penned. In a full-circle moment, it's being released as a double A-side single alongside their 1962 debut Love Me Do, the last credited track by Lennon, McCartney, Harrison and Starr.