I know it’s a contentious view, but as someone who does a repaint now and again, i’m saying the upper bodyside grey is right from the pictures seen so far. I did an old Dapol 150/2 in this scheme back in the 90s and had the livery diagrams (long gone now of course!) the upper bodyside is Rail grey - found most frequently on the bottom half of triple grey sector liveried freight locos of the late 80s/early 90s. There was a clear separation of the stripes and the upper body grey in ex-works condition.
The M logos are obviously wrong but easily corrected with Fox Transfers!