smart youtube tv
TV Bro, a web browser optimized for Android TV. You can get it on GitHub .
TV Bro (about the only usable, non paid browser out there), Nova player, Oddmar (need xbox or psx controller).
Not yet loaded brit tv channel apps. But those would be great!
Could try Stadia. Not sure how it would function overall on an Android TV, but on the GoogleTV it has a slow menu but once you are in a game its 4K60fps glory. (depending on the game of course. HDR looks great too.)
TV Bro, Fileslinked, FX Explorer
HAL Launcher, Button Mapper, Nova Player, ES Explorer, YVLR, Leo's Fortune.
Blokada, to block ads.