[Horizon]

.... the BBC and Japan's NHK have adopted HLG as their HDR standard which is backwards compataible with current 4k tvs. So, as they are the two most advanced broadcasters in the world, I would assume HLG will be the HDR standard for broadcast tv.

HDR10 and Dolby Vision being the other standards, so it can't be that difficult for VM to have all three built into their new V6 right from the start.

As for SkyQ, I don't know if their boxes can be software upgraded for all three standards. Sky are very quiet on the issue, but as they're going to launch 4k footie, they must be using at least one HDR standard and as HLG is able to be used for all current 4k tvs, I think you have your answer...