Maintainability and Reliability go hand-in-hand with availability.
Yes, I can get parts for the Ford at laughably low costs..They make millions of them, and everyone sells parts.
But surprisingly, I have never had trouble getting parts for the Jag, if one does some online legwork. For example, I just got a set of fuel injectors. Since the system uses a common Bosch injector (It's an XJ40) there are about fifty models that use the same thing. When one gets bitten is when it is a Coventry part!
Well, it keeps my wife happy. She shows it at the annual concourse and takes seconds with it, and has a ...relationship..with it that borders on perversion.