Recorded videos colours are really bright. But only on some software
This was caused by a setting in Windows 10.
There's an option to display HD for certain games which was on and I had to switch it off.
To get to the setting right click your desktop and click on "display settings" or else go to the Windows 10 home/start menu and click on the cog (settings) and find "display".
Under the heading "Windows HD Colour"
Switch off "Use HDR"
This also stopped the delay in recording!