You've probably forgotten your remark about AWB in daylight on the Nikon colour thread a week or so ago.
Whatever, I've had a horrible struggle with colour and Nikon ever since the advent of the D1x - why it never occurred to take it off AWB is beyond comprehension, but we all have our blind spots.
Since your message on the 21st:
I've set the AWB to daylight, and my problems have gone - I just can't tell you how grateful I am.
Here is an example shot at 7.22 this morning - the light and colour is just how I saw it; AWB would have produced some horrible yellow cast, but in this case I've changed nothing.
The final proof was this evening, I was doing some horse and rider shots just before sunset, and again, the colour was spot on.
So simple and soooo goood!
It just goes to show how useful forums like this can be (so thank you Guy and Jack for making it all possible as well).