Fleet Air Arm colours

[Dizzyfugu]

I'd have assumed Temperate Sea Scheme - extra dark sea grey/dark slate grey uppers with Sky undersides.

Would have been my suggestion, too. Even the American aircraft that operated in the area at the same time had a similar paint scheme, just done with American color substitutes.
And biplanes with the scheme (e. g. the Walrus) were counter-shaded with lighter tones on the lower wings and flanks.

[PR19_Kit]

That stacks up with the B&W pics I have, yes.

All I have to do now is find the paint........