Thanks Tony and Jure,
I may be getting closer to understanding this. It seems to be a fairly subtle difference between the Mark I and Mark II, with those Mark II with tropical filters being a more obvious variant. Is that correct?
Tony, would that make the 3rd , 4th and 5th photos on your post Mk II's? I know that the 5th is a Mk II of 809 on Victorious from the Donald Duck emblem and 809 was entirely Mk IIs at the time. There is another photo of the same aircraft flying off taken from the front which seems to have the wider intake you describe. If I could work out how to do it I'd post that picture, I found it in Ray Sturtivant's book "FAA at War".
Jure, thanks for the link to the picture of the flight deck of Victorious. It a brilliant image, very evocative of the place. I hadn't seen that one before but there is a very similar shot of the same scene with a different Code letter G aircraft without the tropical air filters which establishes that both variants of the Mk II were supplied to 809.
To properly represent a Mk II without the tropical filters would therefore involve a bit of modification to any of the Kits I've referred to or is there a version out there that anyone could point me to?
Cheers
Henry