thanks Nigel. I've just compared this with W/Fs sanctuary blue, which I think on balance is perhaps a little more of a softer blue blue, if you know what I mean - this T/Webb colour looks a little harsh in comparison - not quite so appealing at the W/Fs colour.
Thanks for the correction on the pattern, my apologies - you're correct - and this one is indeed 'cascade'..........it has some similarity to the 'horizontal wave' pattern although with that design the lines are spaced further apart and the undulations are less intense.
All of these T/Webb decorative designs can be seen (in b. & w.) on pages 432 and 433 of Charles Hajdamach's book 'British Glass 1800 - 1914' - I should read the books more often.

According to Hajdamach (the author's book on C20 Glass, page 141), 'Venetian Ripple', and I quote, "is known in the trade as heavy pillar mould" ................. which if you look again at page 432 in the earlier book under 'pillar', seems not to be rippling

. However, apparently 'pillar' is also known sometimes in a round/twisted form...........so guess that's possibly where the reference comes from.
Of course, I could be very wrong, in which case someone correct me.
thanks again.