It’s some times difficult to find help, however once you do, things get easy and smooth. Apple warranty is great, no fuss of phone is under warranty you are looked after.

Posting this in case anyone else has a similar problem. I updated to iOS 12.1.1 on my iPad Air 2. It caused massive issues with the display, making many images impossible to correctly see. The user interface was less crisp and images and videos were useless to view as they were blurred with greens and reds making them look like abstract art. Very concerning after simply downloading an update. After over 2 hours on the phone with Apple (a lovely support person, albeit no fix) I had to go to their store. Following further checks at the store, they replaced the iPad free of charge. A frustrating day, but at least Apple made good on the problem.