Ford used to sell company cars (esp in the uk) with 4 models: The Fiesta, The Escort (replaced with focus), the Sierra (replaced with mondeo), and the Granada (phased out).

So your new guys get the fiesta, others get escort, the higher sales guys get Seirras and the manager get the Granada.

Then they phased out the top car, and it was replaced with the higher end Mondeo (titainium) spec levels.

Of course, company snobbery means the manager doesn't want the same car as someone under him, so they started to want BMW 5 series and the like.

Ford bought Jagaur and at some point someone had the idea to build the high end mondeo as a low end Jag, thereby upping the company snobbery a bit, and trying to bring all the sales back into their own brand, the X-type was basically the result.