Two tone gray.
Ahh, not very familiar with class 92, only ever seen one close up before.
A quick photo search for class 92 shows that it could have been one of those.
I really only saw it briefly from 3/4 to side on, hiding in the trees.
As I said the traffic on my side of the road had most of my attention... much as I would have liked to stare to the right for a few seconds, the lanes either side of me were too busy to permit more than a glance!
Sorry for the duff gen