airplay not working on one iPad, others are ok???

We have a setup here that has an ATV setup on a Wi-fi so any user with a company supplied iPad can connect to it.

I have one iPad, that for some reason when double clicking the home button and scrolling it won't display the Airplay/Mirroring icon. I have checked with my iPad and another iPad has been tested and connects fine, so no issue with the ATV.

The iPad at fault has the same software version as mine (6.1.2) also the iPad can connect to the Internet with not issues

Any thoughts???