thanks for all the replies

Comments about the presence (or otherwise) of backstamps and labels got me looking at some of my examples to see just what sort of marks they are showing.
Looking at my total of 22 candlesticks/holders that would have been King's Lynn products designed by RSW, these include examples of Sheringham - Sandringham and Brancaster, plus three examples of the squat candleholder/vases RSW 58 (not shown in Tobin's book, but in Miller's). I also have a pair of the 'Helix' candlestick, although I do appreciate that this design is not RSW, but I've thrown it in as it's a similar type of article.
The majority - fifteen pieces - show a backstamp of 'Wedgwood/England' placed on the underside of the foot (roughly in the centre). One of the 'Helix' sticks carries a gold coloured oval shaped label with WEDGWOOD over ENGLAND.
Four pieces are devoid of any markings/labels, and these are 3 Sheringham's and 1 Brancaster.
One of RSW58 holders/vases is without a backstamp, but does have the older paper label showing the word WEDGWOOD in the shape/colour of a horseshoe, underscored with the word ENGLAND.
The final two pieces - one each of Sandringham and Sheringham - in addition to the backstamp of WEDGWOOD/ENGLAND also carry the Portland Vase logo.
Coming to RSW vases - I have only two of the colour combination pieces (RSW 103), neither of which carry any backstamp or label.
As for the Cylinder vases (RSW 20) - the amethyst is entirely without marks/labels as discussed above - the cranberry piece carries WEDWOOD/ENGLAND plus the Portland Vase logo - and finally the White Opal example carries only the original 'horseshoe' coloured paper label. I guess also that in the space of 40 years, or whatever, paper labels can go awol.
So it seems there was definitely a proportion of these products that were retailed without any markings/labels. My humble opinion re the cylinder vases is that they are not too difficult to id - the problems I had with my amethyst example were simply that in my earlier ignorance of RSW pieces (and not having Susan Tobin's book), plus the complete absence of any marks/labels - I was simply unaware of the variety of RSW products. I don't have a problem with the amethyst cylinder being RSW - at least insofar as Tobin's book includes this colour for the RSW20 pattern, but if it can be proven otherwise..........

Over the past 3 - 4 years I have had a variety of animals - mostly now given away - but somewhere in the recesses of the sheds there are examples of a polar bear, snail, owl, porpoise, mushrooms, apples and pears etc. and I seem to remember they do mostly have backstamps, although none has, for me the same interest as the sticks or vases - I think it's only Rosie that collects these wee creatures.

I have a pale citrine coloured uncut decanter that carries both the words and vase logo - although I don't see it in Tobin's book (the lady did admit that the book is not comprehensive).
Might we now add this thread to British Glass?