Jay --
I am not too tightly wrapped on RN camouflage, but there are some members of the Forum who are knowledgeable and I am sure they will weigh in.
You probably already know about the following sources, but just in case:
The Ship Camouflage Website (If I were you, I would try contacting these folks directly and ask them the question)
http://www.floatingdrydock.com/ (Mostly U.S. camouflage, but again, a direct query might bear fruit)
Naval
Since my fascination for ships is, in order: 1880s to 1945 USN, IJN, and Royal Navy (then Italian, French, Scandanavian, and Polish), and then KoWar-era ROK Navy, I look forward to anything you come up with.
Don