3 cam followers being replaced under warranty.
Impossible to prove but looking at the wear patterns it looks like incorrect clearances to me (I've been to look at the car with the technicians) especially as the cam is untouched for wear or grooving, measures the same etc., Also, the cam followers are not grouped together and the amount of wear on each differs, one is very bad. Doesn't seem to be any reason why it might have had oil starvation at the top of the engine plus the wear is very polished suggesting it's been happening over a period. Basically they are all carrying three flats on the follower rather than a smooth curve. All the other followers are fine.
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