"You may also wish to register a complaint with ITV directly about this."
A few years ago, ITV Player on the iOS devices supported Apple's Airplay. It wasn't great, but worked 9 times out of ten. Then, when they renamed the player "ITV Hub", Airplay stopped working (it's not specifically disabled in the program, it just doesn't work). A few people complained. ITV's reposonse? To put an FAQ on their support page that cautions that Airplay may not work.
Now, it's true that the ITV hub doesn't offer Airplay as an option. It's accessible as "Airplay Mirroring" on the Control Centre in iOS. However, if they cannot support it, then the App should check if it's on, and display an error rather than just refusing to play anything. For instance, the old 4od app would stream a rather nice looking screen saying that the licences they had with the various makers didn't allow streaming over Airplay.