Thanks for your input John. FYI , which may help if it happens again at your end:
I sent them an e-mail describing the issue, and amazingly they responded within 3 hours with some suggestions.
I think the techie help desk may have been in France somewhere given his name. Impeccable English - may have been an AI based techie working on keywords?
I'd already told him I could stream live ITV and UK ch4 ok & that the BBC recognized I was using a VPN because my IP address was "masked"- whatever that means?
- He first suggested trying the other UK servers available on the setup - there are 4 server locales in the UK on the VPN service I use. None would let me stream any of the Beeb channels on iPlayer. I'd already done that before I contacted them initially.
- His other suggestion was to clear cache & cookies, which I also had done a couple of times after rebooting my system (Win 10 desktop) before my request to them. I then, after his response, cleared cache a couple of times after a reboot and this time it worked !!
It's still a mystery as to exactly what really happened - especially as the message on the BBC about a VPN "masking my IP " was the first time I had ever seen it ??
Odd to say the least.