Sir Paul speaks about his conversion to a meat-free lifestyle
Discovery captures Beatle performing 1964 Peter And Gordon hit 'A World Without Love'
Elvis Costello also set to appear in advert for vegetarian TV advert
The animation also features Macca singing 'Heart of the Country'
Randall Miller to tell story of studio beloved by Lennon & McCartney
Track is taken from 'Sound City' documentary
Macca performs 'Cut Me Some Slack' again with new friends
Singer says livestock initiative could make 'considerable difference to future of planet'
Macca joins all-star line up for 'He Ain't Heavy, He's My Brother' cover
Beatles singer will be immortalised in comic's last issue