Tengrainbread - I had only very limited experience with the brand and based on that I assumed all Terry bikes were customs and so I confidently but wrongly assured the PO that while a very nice bike it couldn't be a Terry. My bad but saved me cash on the deal!
Tom - thank you on the Tano reference. Last night I saw an article on Georgina Terry and in it, it described her having Tano making her 700c/24 frames and then Tano agreeing to make 700c/24 frames for Centurion which effectively cut her feet out from under her for a time. I couldn't find the article again this morning and couldn't recall that name.
As for her making some, in her blogs on her website she said she started with a frame for herself and then others asked for frames and so she began to make then in batches of 5. Presumably she made a good few because she still takes orders.
https://georgenaterry.com/order/
I'm tempted to switch out the triple for myself but it seems set up for touring so will leave it and see how it looks cleaned up.
Thanks all WGB