Thanks for the info so far.
However its a colour match for the original white plastic I would mostly like. My c5 has, at some stage, been painted purple, and then later on, some shade of white. So now with the existing scuff marks, there is exposed purple paint. I would like to repaint the white to match the original colour so that if i was to get any more scuffs, I would have the same paint to blend in, as well as returning it to its original state.
I have only found so far on this forum that ford olive grey is a close match to the grey plastic.