Found this a while ago and picked it up because of its RD no. (741069). Checked the Blue Book and Great Glass and it's not shown in either, but the date would be 1928.
Tonight I had an email from Thomas Joyce
in Dublin, who has the same item, and who has a copy of the registration detail from the National Archive at Kew:
Registered: 741069, Class: 4, Date: 11 October 1928
Registrant: Edwin Kelley (British Subject), 41 Chudleigh Road, Brockley, London SE4
Copyright expired: 11 October 1933.
... one other snippet that Thomas mentioned was:
The interesting point about the registration number is that they supplied a photo of a ceramic dish to register the design
...which makes sense as the registration was Class 4 - Earthenware rather than Class 3 - Glass.
What Thomas and I would like to know is, who was Edwin Kelley? I can't find anything about him anywhere... so was he a china and glass merchant / wholesaler perhaps? Has anyone heard of Edwin Kelley before please?