The company has reunited members of the original choir to record a new version of the song, which sold a million copies and spent two weeks at number one when first released in 1980, proceeds from which will go to its Big Knit charity.
The , whose members are now aged in their late 30s, counts a police detective, HR consultant and mortgage advisor among its ranks.
To mark the launch of the single, released today via iTunes, 14 members of the original choir are braving the rain for a live performance of the song in the bandstand in London's Regent's Park at 10.30 this morning.
The Original St Winfred's School Choir
Fleetwood Mac and Britney Spears producer Darran Bennett and former 'X Factor' vocal coach Annie Skates have both helped put the record together.
Now in its sixth year, the Big Knit campaign asks members of the public to hand-knit woollen hats for innocent Smoothies and Squeezies, and woollen warmers for innocent Veg Pots. For every woolly product sold in Sainsbury's stores, innocent and Sainsbury's give 35p to Age Concern and Help the Aged.