Thanks for the input, Steven.
My pair are H=35mm, L=235mm, W=95mm. According to the sizes given in Dansk Glas: 1825 - 1925, these are the same proportions, give or take a mm or two, as the Kastrup/Fyens models.
Don't know if anyone has any definitively attributable to British glassworks that are this size also? It's hard to judge where mine came from as I've only really paid attention to them locally - and there's quite a bit of Danish design c.1900-1950 in the Lincolnshire area because of the links to Denmark through the fishing industry.