Brian,
Would you be prepared to name & shame the OPC? Alternatively you could e-mail me instead if you don't want to embarrass them.
Last November I tried unsuccessfully with 3 OPC's to book my car in for the "Yearly Maintenance" service as I had only covered 4K miles during the past 12 months / since the 24K mile service. Two of the OPC's were prepared to offer the yearly maintenance service but at a premium. The other OPC which is owned by PAG, offered to do the yearly service for a reasonable price BUT advised me they wouldn't rumber stamp my service history to reflect this. Their reason for this was "service intervals have changed since MY2002 and Porsche want to discourage owners from opting for the yearly maintenance service, when covering less than 9K miles P/A, in between the scheduled services". Bollox to that I said and opted for the 36K mile service [@ 24,600 miles] and supplied my own Mobil1" So this full service cost me only slightly more than I had been quoted by 2 OPC's for the yearly maintenance service, plus it's probably more beneficial for my car in the long run.
You have to admire the OPC's for having the balls to charge £100+ for liquid gold, sorry Mobil1. As it's possible to source Mobil1 4L circa £16 wholesale, I'd love to know how much an OPC pays per litre? I was charged £120 for 9L during the 24K mile service and provided with yet another 1L top-up bottle which was left in the front bay beside the unopened one from the previous service.
Cheers,
Andy