Ok, so i've bottled it.
Was nervous of using untried Tamiya paints though an airbrush i've not used for so long on such a nice kit.
And the paint i'd chosen when painted by brush is FAR too dark.
So, instead, i've put on a coat of white then a very light dusting of Ford Ivory, which i had left over from my 2001 Orion project.
That's a very intense colour but, put on lightly, its not a bad match for the "creamy grey white" that the Y Wings seem to have.
Not that its apparent in this pic - decided to take some shots outside. And, even though its an overcast day in Kent, its washed the shot out something chronic.