The ISP is UK based and I'm not using a VPN, and yes I have tried using a VPN but I get the same result.
This has helped before
This could be a setting on your iPhone / iPad.
Apple recently added new features to ‘Safari’ and you can change them in settings.
‘Settings’ -> ‘Safari’ -> ‘Hide IP Address’. This gives you several options and by default ‘Trackers & Websites’ is set to the default. If you change this to ‘off’ this may resolve your problem. Certainly has helped me with a few difficult websites.
Also recently this proved successful
Finally found the answer to the problem.
Tracking was blocked for trackers and websites.
Can’t believe how this has caused the problem.
Need to catch up on the reviews now.