I have had a couple of prompts on BT YouView to download the TV App Extra. But when I fill in my details and go to the next pages, it seems to be trying to sell me an additional subscription and box i.e. not "free".
I thought it was just an app for the mobile phone extra so occasionally I could watch BT TV from it though I can't see me using very often.
Add TV App Extra Place your order for the free TV App Extra bolt-on
BT TV App Extra is an upgraded subscription service and offers more and improved functions from the free version. For £5 per month you can have access on 4 devices and have the large screen experience.