kiwiharry:After 4 weeks parts hadn't arrived and after thinking about things over those weeks I finally decided to formally reject the car based on the on-going issues and I didn't feel replacing the same brand new part again would really solve the issue.
I have had several items that went faulty and when the faulty part was replaced it went faulty again. The problem being that the spare parts are usually from the same early production as the original faulty part. Later production may have a fix but it is not always guaranteed that the fix makes it into the spares chain.