The weather finally cleared so I could test out the D500, first steps of course is calibrating lenses. Things went OK with the Tamron 150-600mm and the Nikon 500mm F4, needing around -2/-3.
But then things went rapidly downhill with shorter focal lengths.
The AF35mm F2D was way out and needed -17, the AF50mm F1.8D -14, and on it went till -20 wasn't enough for the AF20mm F2.8D. Changing the distance produced outrageous changes of focus and I realized that the whole focus system was out of kilter. None of them needed anything more than -3/-4 on the D7100, except the 500mm which needed -8. Obviously the registration distance and AF sensors distance bore no relation in a linear sense.
I emailed Priceminister stating I would return it for a refund, fortunately I'm well within the 14 days return period!
A great pity because so far both my Nikons haven't put a foot wrong with accurate AF and not even a niggle, I hoped that as the D500 is a pro camera extra care and quality control would have been taken.
BTW. The camera's presentation was perfect and nothing leads me suspect that it was anything other than a brand new camera straight out of the box.
Regrouping and hoping for better luck with the next D500!
Update: I've just received an email from Priceminister and am awaiting instructions for the return.