Thanks so much to all of you for your kind responses.
This one
... If she wants to paint an aeroplane purple then go for it, there are no hard and fast rules to say that all of our models have to be historically correct, it's her model so she can paint it what ever colour she chooses...Des.
was especially dangerous because she then decided that the Roland C.II Walfisch, which is 'fat and cute' could thus be painted purple with a fluffy white kitten on the fuselage. Apparently this is the aircraft piloted by 'von Richthofen's hairdresser with his shampoo boy riding in the back seat'. I am further informed that these brave men, from the most exclusive salon in Berlin, periodically dodged the flak and enemy planes over the front lines to ensure the Red Baron always had a perfect and fashionable coiffure, bad hair days being deleterious to aerial combat.
I am grateful for being rescued from this course of action by CoyoteMagic's timely posting of Hans-Georg von der Marwitz's Pfalz DIIIa, which has fortunately found favour with her although she's "not big on orange". Nevertheless, we'll be going with this, but as we've recently moved and are still settling in it may take awhile to acquire the model and start work as all my hobby stuff is still in boxes. But we'll keep you up to date, and maybe even do a build log!
Again, I appreciate your valuable input.