Success, Roy! Greener it was.
Greener & Co. RD 196641, registered 10 August 1892 (described by Thompson as " pattern, mostly imit. cut").
I only had two reference photos for this pattern, both for small tumblers - one in opalescent yellow uranium glass, and the other in blue opalescent glass - but, for reason, I hadn't added them to the GMB RD database.
The photos of the cream jug will be a nice addition to the GMB RD reference files, and I intend to add those + both my other photos asap.
Fred.