National markings are a legal obligation, tanker markings aren't. Whenever we flew partly painted a/c in primer (or even in bare metal) after air tests to whichever was the latest cheapo place the gingerbeers had discovered for the 'real' repaint, roundels and registrations were applied.
I'm not sure, Art F, but were the a/c still repainted at StAthan/Brize/Abingdon when you left the fleet - or at Shat o' Roo?
Without the tanker markings, there were definite F700 restrictions on AAR.
This colour is a special purpose undercoat over which the normal John Major Grey will be applied, as far as I'm aware. I'm surprised to see it flying in that state though - unless KwintyKwoo are off to Las Vegas for more spurious 'hot weather trials', the Gulf not being quite hot enough for them at this time of year......??