<<things would be much neater if it came out closer to +12!>>
Thanks for both your comments and help and I tend to agree. I shall run the 45mm test again in a few days time and see what happens. Thom Hogan recommends LensAlign in his D800 book and I have asked him what are his thoughts of FocusTune are, as I think his opinion would be interesting.
Anyway, I was surprised and pleased in equal measure regarding the results. I have also looked carefully at the LensAlign images and think +7 is the best overall setting.
Anyway, busy for a few days but will rerun the test at 45mm. I also need to do my 16-35mm f4, 50mm f1.8G and 60mm f2.8 micro.
Had A reply from Thom Hogan says "Variability of results is one of the issues everyone is having with the Nikon D800 lately". I wonder if that refers to user error or camera focus error!.