Duck Enterprises appears to have been a one-off label. It issued at least one single, 'Lady Mary' by the John Abbey Band, which had a catalogue number of DUC-101 and came out in 1977. I presume it was a DIY effort, that being a good year for such things; but... Steve of the Low Down Kids site, who kindly supplied the scan, says that the band was from Leicester, and describes the music on the record as Folky / Poppy / Singer-Songwriter material. Thanks to him for his input, and to Sam Mauger for bringing the label to my attention.
Copyright 2010 Robert Lyons.