Les_bailey

In all of those 3 photos, the locos have full yellow ends on my monitor, in full size this is obvious, you can see the yellow ends, and on the BW ones the border between the blue & the yellow. The effect you see is because the depot staff have only cleaned the nose (ie the bits they could reach). Roofs often looked grey in still photos, this effect was the sun lighting up the upper surfaces, this often showed up on all blue class 37s, the green/blue cab roofs on class 20s etc. On 22s (and the D600s) the effect would be also prominent due the roof panels being firbre-glass type material, the paint here would fade quicker than the sides too. On the colour pic, the fading has obviously been going on for a while, as the BR lion & Wheel logo is also visible through the blue paint.

May I also point out a livery variation I knew nothing of, in the slideshow on post 30 above, the pic of 8508 in green full yellow ends, has had the cab ends painted in the dark loco green, leaving only the side window area in the light green. All the other in green have light green cab ends.