Thanks for the prompt replies gentlemen.
The pictures will undoubtedly help, although they are a big ambiguous. Allow me to expand a bit.
The colour demarcations between upper an lower shades line up along the small air intakes on each side of the lower nose.
At the rear they run just above the Sparrow missile wells.
On the last shot, looking carefully I can make out a tonal difference at the back end of the aircraft. This is not obvious at the front.
I'll leave it up to my mate to make the call!
Thanks again.
B