Sudden problems viewing Wikipedia via Plusnet

[#1]

About a week ago we started having problems getting Wikipedia pages to load, as far as we can tell all other sites load fine but any link to Wikipedia does not load. If we switch WiFi off on our mobiles and go to 5G Wikipedia works as expected but all anything connected to WiFi through Plusnet won't load Wikipedia pages.

1) We are using macOS and have tried both Safari & Firefox.

2) Have tried using alternative DNS servers.

3) Cleared the caches of browsers.

4) If we ping en.wikipedia.org we get an instant response.

We can't remember this ever happening before.

Bound to be something stupid - but what?

[#2]

@annapp  This a known issue. See this thread,,,,,,,,,  Wikipedia problem 

Not helpful but just for info Wikipedia works for me on Plusnet FTTC Windows10 MS Edge browser.

[#3]

Thanks for that thread link, I did search the forum before posting, don't know why I didn't see that thread! Glad it's not just us.