<p>The BT Sport app closed on 12th October and has been replaced by discovery+. <a href="https://community.bt.com/t5/TNT-Sports-on-TV-Online-player/The-BT-Sport-app-is-closing-on-12th-October/td-p/2312034">Find out more about activating TNT Sports on the discovery+ app</a>.
Good to see that the app on Apple TV 4K has been upgraded to output full chroma subsampling at 4:4:4 on BT Sport Ultimate. It looks better than the same stream on the BT TV 4K box which only provides 4:2:0. Obviously, you can record with the BT TV 4k box.