In addition to what Jase said

Some later ones have a third headrest in the rear and a 3 point seat belt to go with it.

(my 54 reg didn't have that , just a lap restraint in the middle and no head rest.)

Also earlier cars have a plastic cover to hide/protect the battery, later ones don't

(Much to their owners disgust.. lol)

The 3rd headrest was a £45 option! Also included an extra light on cluster to show if rear bench was up or down

I missed batt cover and c/c'd handles!

Also the yellow changed from lemon (nice) to sprint (urgh)

I never knew that was an option, our 54 Ambiente SDI had the 3 headrests,

3 point belt and warning lamp but weirdly my vRS did have the seat back warning lamp.