So, first coat on the helmets, Valejo's Flat Earth. I can't remember at all if I gave the speeder pilots' helmets a brown coat or not, so I'm going to leave it at this second coat, with some of the black still coming through. I also found the yellow mix I had made for them in an airbrush jar, which apparently doesn't seal 100% anymore so well, erm, at least I have a perfect colour sample of the base colour to try and emulate again.
Alrighty, off the alchemy shed...