Thanks Glenn and Woody. Got the first coat of Dark Green on, using Humbrol No.163 satin enamel, which has more 'depth' than the matt No.30, giving a better contrast (the airframes were resprayed in the Dark Earth, over Ocean Grey, on arrival in India).
As I suspected with this paint, it was rather thin, with a heavy carrier to pigment content, and takes some time to dry, and then does so patchy. No major problem though (I hope!) as, after a second, tighter coat, and then the clear coats, it should all even out nicely.
I'll let this first coat dry for at least 18 hours, before applying another coat (and eliminating the splotch on the starboard wing!), then it'll be time for some subtle shading and weathering.
Thanks again for your interest and compliments.