Sorry paul I seem to have confused you a little. The interior would be, possibly, pinky red
IF the fuselage was fabric covered, and I don't think it is. So the interior would probably be interior green, which is a light grey green.
I'm not sure which paint I used for the Spitfire. Use aluminium, rather than silver though, it will look better. Remember other paints do not adhere well to metalic paints, so if you paint over it with another colour, then mask over that you will likely lift it when you remove the tape.
Just incase you don't know, a tip when airbrushing metalic paints. Add a couple off BB's to the paint jar and adgitate them regularly. Metalic paint is made with actual metal flakes, which settle quickly. If, like me you have a gravity feed air brush, with a small colour cup, then use a small amount of paint at a time and use a cocktail stick, or similar to adgitate the paint.
Another point, the fabric covered surfaces would be more matt than the metal areas. You can add a drop or 2 of colour to the basic aluminium to give a different look. I would suggest that you experiment if you do this. You couls also get a different look by apply matt varnish the the fabric areas.
I'm afraid I have no idea of the colour of RAF uniforms in the Med, although it is possible that army gear was used? I've never seen RAF blue shorts. That'ed be my guess, if the crew are waring shorts. Army gear was Kahki, it would have faded pretty fast in the med so would have been a light tan/buff colour.
I don't drybrush the outside of my aircraft models, but if you were to on this scheme then silver, or crome silver would give you highlights.
I use oil paint as a wash, on the Spitfire I used dark grey. You may get away without a protective coat, but I use Klear (Future in the US)
Mal