Can someone with ITV Hub on AppleTV check BGT. Is it in HD or not? Looks suspiciously like it to me. If so it's quite a step forward.
Doesn't look like it to me. The telltale sign of sharp text on graphics isn't there.
Hang on - I'll check. If you link your ATV with Xcode on your Mac you can enable the player HUD in developer settings that shows you an overlay with resolution, codec, frame rate, audio and video bitrate etc. info of the video being played.