Thanks for the replies. I have re-checked the settings and they are all as they should be. I guess it must be the HDMI Cable which is this one and 10m long?
4K HDMI Cable 10M HDMI Lead - Ultra High-Speed 18Gbps HDMI 2.0b Cord [email protected] UHD 2160p
Problem is HDR from my UB9000 BD player is fine, it's just the SKY Q box
The main difference is that the UB9000 is running at 24p, which will use 8.9Gbps (or thereabouts), sky at 60hz will be using over 12Gbps. This is quite an increase.
If we look at HDMI cables for the moment, copper has a natural resistance to it, so over longer lengths this resistance builds up, at which point the bandwidth the cable can take starts to diminish. This is why people often use AOC (active optical cables) or HDBaseT for HDMI connections over length.
Some of these 'cheaper' cables do work, but it can be hit and miss, and they can stop working at a later date, as they are not designed to transmit these bandwidths over these distances, so are really working past their potential.