As most know I am a yank and a (US) Navy Vet. I have looked at several of the threads and pics of the various ships, most notably the type 42 being built. My question is this; I have seen a lot of full scale RN paint (back to back NATO cruises in the 80's) and I do not recall that RN hull paint is that green (thought it was more blue) maybe my monitor is off a little.
Foo
There are many things that can effect the appearance of colour.
As you pointed out, your monitor.
Also the type of film used in the camera that took the shot.
The time of day, latitude and season will affect the lighting of the subject. For example at sundown there will be more red in the natural light.
Direct sun verses cloudy day.
If the photographer used any polarising or other filters on the camera lens. I assume that no UV filter would make images a bit bluer.
etc.
etc.
etc.
If you go with the recomended colours given above you cannot go far wrong.