Just to add some perspective on the courtesy car, clearly I would prefer to be driving a Porsche courtesy car, but in my experience having had a Porsche 10 years ago, I seemed to remember most OPC's would run a fleet of premium marque vehicles, Audi, BMW, Mercedes etc. My situation was a little unusual as my local OPC ultimately were simply putting me in touch with M&A who ran some Fiesta's which initially I used, upon lodging my complaint with Porsche GB, they immediately used the Porsche Assistance arrangement they have with Enterprise rent a car and swapped me into a BMW 520d. To be honest this is something I can't fault. Despite not driving a Porsche, I was more concerned in getting my car to the standard it should have been in when I bought it.
I'm pleased to say all sorted now, a couple of minor warranty anomalies which are work in progress but getting there.