I hadn't thought of that. Good idea.
It took a bit of work. Their system is a bit picky about which browser it deals with.
Apparently the answer is Dark Sea Grey.
I am looking to model an RAF rescue Sea King in the Grey scheme from the Falklands.
Being grey means it will be a problem as to which one.
References quote it variously as Dark Sea Grey, Extra Dark Sea Grey or Dark Admiralty Grey.
There are quite a few colour photos about and these show...