I think it is probably Czech.
It is remarkably similar shape to a cased in opaline and cut to clear Kralik vase I own.
I'll have a look at the sheet I was sent on the Kralik vase and see if your pattern is on there.
It is not on the sheet and I think the shape is slightly wrong I'm afraid.
The Kralik shape I'm thinking of is slightly wider at the base than yours, so it appears that the sides curve out from the top and then almost go straight down to the base.
I still think yours is likely Czech rather than English though. The other option worth exploring might be Ajka.
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