Rob,
I use Colourcoat paints for steel ships so I’m not sure what the color match for Vallejo would be but here are the colors for the QE 1918. I hope these help.
Steve
Vertical surfaces are a RN #1 Grey, which is a Medium Grey like Sky Grey 70.989
Steel Decks are RN #4, which is a Dark Grey. Like Basalt Grey 70.869
Both are almost smack dap in the middle of the Grey range. Not to Blue though.
Funnel Caps are Black
Wooden decks are Teak
Bridge decks are RN Corticene which runs towards the Redish Brown but neither dark nor light.
Anti Fouling is a Brownish Red but more on the Red side.