Further to my previous entry in this posting....
When I went to pick up the car from Hunters (now Inchcape) at Brock (Preston) they told me that it was probably the lower arm bushes causing the issue. They also stated that this was a wear item and as such it wasn't covered by warranty. The cost of replacing the arms, would be £600. I asked if this would definitely stop the knocking and they replied, we can't guarantee it. At this point I grabbed my keys and left.
It's some months later and after placing my car in the hands of the Farnell dealership in Nelson, Lancashire the issue has now been resolved at no cost to me. The work undertaken included replacing both front struts, both front lower arms and a new Valve block. They also spotted a slight oil leak from one of the turbos and fixed that also. The difference in attitude and customer service was like chalk and cheese when compared to Hunters. I vow never to visit Hunters again.
It's a major concern that there's such a difference in the way different dealerships treat customer issues. It shouldn't be down to the customer to try and find a supportive dealership but given other owner posts on this forum it appears to be the norm. 2013 SDV8 Autobiography
2011 L322 TDV8 Vogue SE - gone
2006 L322 3.6 Vogue Se - gone
1999 P38 4.0 se - gone
199? Classic 3.5 - gone