Best and cheap DVD Rental by post in the UK. With a catalogue of over 100,000 titles, CinemaParadiso.co.uk is fast DVD Rental service with free postage both ways.
www.cinemaparadiso.co.uk
The only one left that I am aware of after Amazon bought out Lovefilm and then shut it down.
The X Box thing is all about a bug in the 2.1HDMI connections on the Denon - apparently they will not allow 4K/120Hz gaming. I'm not a gamer so personally I think it's rather overhyped, but apparently those that know say that 120hz is overrated anyway as it involves restricting resolution elsewhere, so most people end up playing in 4K/60Hz anyway. Also the PS5 does work ok, it's only the X Box to the best of my knowledge.