In 1969, Decca launched a true progressive label called Nova, which lasted less than a year. The label released 23 albums with "Deram Nova" or "Decca Nova" imprints, and to add to the confusion, some of these came with a "Deram Nova" logo on the sleeve but a "Decca Nova" label.
Consequently, "Decca Nova" and "Deram Nova" are no separate labels, yet they are not related to the German "Nova" label, which -- even though also focusing on progressive rock and being a subsidiary of Decca (Teldec = Telefunken/Decca) -- was founded four years after Decca Nova/Deram Nova's demise, in 1974.