Aires 1/72 AV-8B pit is out and is gorgeous, with exactly the same level of detail as the 1/48 kit (I bought a pair to put into my 1/72 TAV-8B). Appears to be a direct pantograph down, including etch and photo-instruments. Quickboost do a speedbrake and well, and ObscureCo do a very nice set of nozzles. All are designed for the Hasegawa kit, but should fit the Airfix kit too. Eduard do a number of sets for the interior and exterior bits. The only issue with the Aires set fot he kit you are doing is that their current release is for the day Harrier versions and so the instrument panel is different in layout.
Interior colour is FS36231 as others have already mentioned. Colour matches from mainstream paint ranges are:
Humbrol 140
Tamiya XF-54
Xtracolor/Xtracrylics X131
Gunze Sangyo Acqueous H57 or H317
Model Master 1740