Some things to try when webpages will not load on your iPad, in no particular order:

1) Swipe out of ALL your running apps. Shut the iPad down. Wait 20 seconds. Start it back up again.
This is what we call the iPad Reboot Dance

2) Turn wi-fi off. Wait 20 seconds. Turn it back on again.

3) Your subscription to the network may have expired. Surf to a webpage you’ve never visited before [hamsandwichtees.com, for example]. That should trigger the login page.

4) Try a different web browser – you have three [Safari, Chrome, Firefox].