This isn't complete or fully checked yet. I've also had help from 4 other forum members who will be credited at the bottom of this once it's finished. Until then, I felt it unfair to implicate them in something not fully agreed however if they want to identify themselves as contributors they can do in the following comments.
Overall I, personally, am fairly comfortable that this is the colour palette used. There may be details and spots of white countershading still missed from the illustration. One of our group was leaning towards colour assignment to the camouflage pattern "panels" being different fore and aft on the starboard side of the hull. I share this now in its incomplete state because even like this it's closer than some nonsense on the internet using either completely made-up colours, or assigning true colour names to badly flawed understandings of what the colours were or when they were in use.

In 1941 and earlier though it's pretty non-contentious (although there is still a lot of published material out there parroting the incorrect believe that Admiralty Pattern 507A was Dark Grey, Admiralty Pattern 507C was Light Grey and therefore by logical juxtaposition Admiralty Pattern 507B must be Medium Grey - this is nonsense and we wrote a paper on that subject).

Fast forward to 1943 though and the scheme stayed broadly similar to 1942, but there are evolutionary changes to the pattern shapes and the paints themselves were superceded by a new series which changed the overall look of the ship to a more bluish impression.