Ok so what am I missing here? Have SkyQ and an AppleTV 4K (older generation) which I generally use for streaming apps. Want to watch BBC programs like The Night Manager or Attenborough’s new show, yet on Sky they show as HD only (on demand), and if I go to iPlayer on my AppleTV it just says nothing about HD or 4K 
Surely it’s possible to watch bigger budget programs like The Night Manager in 4K/HDR?
How?

Surely it’s possible to watch bigger budget programs like The Night Manager in 4K/HDR?
How?