On the WD Norton website it showed Rik's bike when he was stripping it. He marked the camouflage and photographed it so he could paint it back the same. I'm sure he won't mind me posting a picture of his bike in camo paint
It doesn't seem to have been the intention that motorcycles within the BEF be camouflaged but there are quite often similarities within units which suggest that instructions were sometimes interpreted differently.
2nd Infantry Division seem to have camouflaged motorcycles.