hi chris we have a 54 plate 2.0l tdci ghia with the mirror lights fitted. not sure if yours will need any wiring as they wereon the car when fitted but i think the ghias have them fitted as standard. you could go and ask ford if your mirrors are the same part number as a ghia model.
Had its 2 year service today (£197). asked the dealers about mirrors with lights, the only thing they said was that he doesnt think the wiring would be there. Might just email ford with registration number and ask them to confirm either way........Chris.