Thanks guys. Steph, I'm looking ahead to the ponies GB and have a camo'd Mustang in mind for that. I have realtively few NMF kits so am leaning toward Dooleybird.
I love it when I start googling for reference pics and it just brings me back to this site. Wojtek posted the below pics in this thread
1/32 Tamiya P-51D MUSTANG :
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It seems clear from the first pic that there is another colour along the lower border of the anti glare panel and the lower sliding canopy frame. As to whether or not it is yellow is another question. The caption on the second pic says it's blue, which makes a bit more sense in my mind as it matches the squadron colours. Still researching.