AO's own brand TV. The website lists suspiciously few features but I looked at photos of the back and decided that it is probably just a rebranded version of this TV (normally £699) :https://finlux.co.uk/tv-55ut3e310b-t
They have a 14 day return policy, so I took a punt. edit: The returns policy is void if you open the box.
Well it has arrived and I can confirm that the manual specifies 4k 60fps over HDMI, which means it is HDMI 2.0 and likely HDCP 2.2. THe manual also confirms HEVC. I'm now certain that it's the same TV as above and has the 'holy trinity' that people keep referring to. Also, the Finlux Remote app works on it.
The smart interface is fine. The menus are a little confusing - they seem to change depending on what input you're using! Even the main menu for adjusting picture and audio are different for different inputs.
Additional features that I've found that aren't mentioned on the website:
Bluetooth for pairing with a phone or soundbar.
WiDi - Wireless display. This works great from my Android phone under the hidden display settings. Won't work properly with either of my Windows laptops, although that is probably more a Windows problem.
Cast YouTube videos straight to it, even without a Chromecast.
Comes with some 3d glasses, however the 3D is very poor. Too blurry to use (unless I'm not configuring properly, which is entirely possible).
Comes with a bunch of analogue converter cables.
The remote even comes with batteries.
You can disable inputs altogether. Perfect for me as I'll be switching between Plex Server and Chromecast only. Woohoo!
The panel is definitely Vestel. It looks good, but not as good as an LG. If you're never going to look at them side-by-side, it probably won't bother you. This deal is really about specs for price.
On the whole, this has exceeded my expectations and is by far the best deal I could for such a large 4k TV with HDMI 2.0, HEVC and HDMCP 2.2.
EDIT: The internal YouTube player / media player is a bit jerky. I get much smoother (although not 4k) playback using my Chromecast. I'd recommend using a Chromecast or external player.
Code DECEMBER30 brings it to £469.