Amazon Prime on BTTV Platform
This seems like an official announcement to me :-
'BT TV will include the Amazon Video app in addition to Netflix and customers will be able to access Now TV from 2019, giving them the widest range of content on any set top box in the UK. BT will be the first major UK TV platform to offer Prime Video through its set top boxes, allowing Prime Members to access thousands of TV episodes and movies, including award-winning Prime Originals and exclusive series like The Grand Tour, The Man in the High Castle, Lucifer, and Vikings.'
Thanks to EmsPops for highlighting this feature on another forum...