HMV Greensleeve Records was a budget-priced Classical label from the EMI group.  HMV Greensleeve was almost exclusively an album label; it appears to have issued only one single, a seasonal offering by the Woodfall Junior School Choir, 'Jingle Bells' (GNS-1).  As the demo label indicates, the single came out in December 1976.  The well-known HMV label itself didn't issue any singles in the '70s - it was shelved in the late '60s and revived briefly in the early '80s. Distributed By EMI Records. Thanks to Robert Lyons For The Info.

76 Woodfall Junior School Choir  Jingle Bells HMV GREENSLEEVE  GNS 1