So, today I’ve managed to buy the last front tyre for my bike in the country. (Well, I hope so, the web site now shows out of stock after ordering but I’ve not had confirmation it’s been dispatched.) No other places I could find have stock of that Avon Cobra Chrome size, and few have much stock of any size, though I also found a rear tyre at one place so ordered it to make sure I have some rubber for a trip to Spain in the spring.
I did ring a place about stock and they said that Goodyear (who bought Avon) were prioritising making their own brands, and were making Avons if and when they thought about it. 
That’s a real pain, because I don’t think there is any radial alternatives for my rear bike tyre, they’re all bias ply.
Of course, if the tyres are in short supply, then a lot of people may move to other brands and they’ll be even less incentive for Goodyear to make them, possibly causing them to discontinue them.
The rear was made in June 2023, before the UK factory closed that year but the front is only 2 months old (December 2024) and made in France, so they are still being made which is good to know. I see they have kept the union jack motif on the sidewalls, (maybe to reuse the existing moulds?)