IPad Air cannot determine location

I have two (Wi-Fi) iPad Airs, two iPhones and a Mac all using the same WiFi router. All will happily report their location correctly apart from one of the iPads which has lost it's ability to do so recently. I have tried all the guidance on these forums to check location settings and even erasing and setting up as new, none of these actions has resolved the location services issue.

All are running the latest OS updates OS X 10.10.3 and iOS 8.3

I appreciate it doesn't have a GPS chip but I'm beginning to wonder if this is a hardware fault given everything else is working?