Hi and welcome to the forum @Anonymous User,
First things first. Can you please confirm the model of your NOW TV playback device?
Is it the NOW TV 'white' (Roku LT) box? Which looks like this: -

Is it the NOW TV 'black' (4200SK - Roku 3) box? Which looks like this: -

Is it the NOW TV 'smart' (4500SK - NOW TV) box? Which looks like this: -

And just-so-you-know... NOW TV have no control over 'third-party' apps, such as BBC iPlayer, ITV Hub, All 4, Demand 5, RedBull TV etc. The content delivery systems and the UI's for each distribution platform is entirely controlled by the service provider.
Cheers