iPad 6.1.2 update no airplay icon

I have just updated my iPad software and now there is no airplay icon, I have read some of the other discussion regarding this and the solution involves switching off router etc.

I use my iPad at work and airplay to deliver lectures, it is impossible for me to switch off the router and resetting my Apple TV will be a job for the IT department and not a good use of their time.

Is there a way to sort this out and can I also state that we should not have to keep mucking around like this, if you intend to update PLEASE make sure it is tested before sending it out Apple, I do not have time for this!