Thanks Guys. I decided that my lightened version of the Darker grey was a tad too light so I created another mix, 4 parts of the original mix and added 1 part XF-66 light grey, much happier with the contrast between the greys now.
Also have now glossed the lower surface, upper and lower tail and Engines too.
So tomorrow its add some decals to give it life or Pastel weathering to the forward fuselage.....