Having started this thread with a request for info., I am now able to offer an answer, should any one scratch a cam cover as I did. The BMW paint is a "Bike paint". The official colour is Graphite Grey and the paint code is M963.
My friendly body shop did the job for £30. (Removed first of course). I did first invest £2+ (+p and P) on a coil remover as I didn't want to risk it with a screwdriver. I'm glad I di as it was very tight.