From other posts on this forum, it seems that opting in/out isn't immediate, it appears that it can take up to 28 days.
Someone please correct me if I'm wrong
Reset the BT Hub 6 yesterday and the BT Wi-Fi SSIDs have magically appeared, even though I had opted out of BT Wi-Fi 5 days before.
I have BTWi-Fi active on 2.4 GHz and BTWi-Fi and BTWiFI-X active on 5 GHz
Tried to reactivate BT Wi-FI via the web link for when I'm next brave enough to go outdoors, but this fails with
Sorry something's gone wrong
There's been a problem while processing your request.
We have registered this problem and will be looking into it shortly.
However, will worry about that at a later date.
Thanks to everyone who responded for your assistance - glad I was not going mad after my wasted conversation with the BT Chat team.