Is it not something to do with the bluetooth? ie whether you have it or not?
Mine has 3 lines and I'm not sure where it was built, couldn't see it on the etis site
I think that changes the size of your centre console screen, but you might be onto something there as no matter how I look at it, the centre console screen is a bit bigger than the 3 lines it states in the brochure.
Apparently the Trip computer is part of a pack (I think it's the bluetooth one) and isn't available on the studio, does anyone have a studio model who can tell us what you have?
In summary, my Fiesta Zetec has 3 lines, 5 doors, bluetooth and was built in Valencia on 31st March.