Did they say what the actual fault was with the cam?
Right, so picked her up yesterday! runs like new again and even better. Think the cam caused my other issues I had as well.
Replaced:
all 8 rocker arms
L and R cams
Oil and oil filter
Labour added to this and total came to just shy of R40k.... one rocker arm is 2k

OomD, BMWSA believes the part was not heat treated properly and most likely something went wrong in the oven when they did it in factory. First in SA since launch of the LC to happen.
So they checking batch numbers etc to see if its just my part or the batch that might cause an issue.
I saw the cam and it was worn away a good 1mm the size of my middle finger nail.

All other cams still nice and smooooth.