Welcome to the club, Les.
The x type is a great car, and is it a real Jaguar.
The so called purists are quite ignorant of practices in the Automotive industry. Jaguar in the 1930s used Standard Engines, and Austins used the Jaguar manufactured Chassis.
Rolls Royce never provided the body of a a car, just the engine and chassis, till the 1950's and Park Ward and Mulliner built the car.
Engine parts are produced by over 140 different companies, as are body section.
The X Type uses a modified floor pan of Mondeo origin -- and some Ford parts this is common practice across all motor manufacturers.
I have driven Rovers with Peugeot engines, and BMW diesels were used in some Land Rovers.
Just enjoy the Jaguar experience.
Regards,
Peter.