Do you have the same problem when you paly UHD content on BBC iPlayer through your V6 box?
If so it's probably because the Sky Sports UHD channel is in HLG, the same as UHD content on iPlayer.
It seems to affect Samsung TV's more than others, if you have a Samsung then check your Gamma setting isn't too high, try 2.2
If you have an LG TV try turning HDMI Ultra HD Deep Colour on or off to see if that helps.
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