I think the reason it doesn't work is because I have my router to force all DNS requests to opendns. I do this so I can control the parent controls and stop my kids accessing sites I don't want them to see. Unfortunately this breaks the ITV hub app.
In some cases, removing the affected channel and then reinstalling it may help. To ensure the process is successful, make sure to restart your device before adding the channel back in. We would recommend doing this from the Settings menu by navigating to Settings > System > Power (If you do not see a Power submenu, skip to the next step.) > System restart.