Hiya Martin. I am new to collecting, but in the early 80s my parents had a shop in Whitby that sold new Perthshire, Baccarat, St Louis, Okra and a few others. I used to work in the shop during holidays and weekends and used to explain to the customers the method of paperweight production (we had a sawn in half pershire paperweight and a big bag of canes behind the counter just for that purpose). Mr Drysdale from Perthshire used to visit their shop annually, because (in his words), their shop "sold the most Perthshire Paperweights in the UK outside of London" which amazed him because Whitby was not known as a centre of glass sales. The shop stock was made up of limited additions from all the makers, so many of the examples being sold and traded will have originated from their shop.
So, once the kids moved out, I have a few more pennies to enable an odd purchase now and then... and yes, I will probably look those Societies up