Hello, I am considering buying a repo'd Ford Focus (X Reg) 1.6 Ghia, however it has no keys. I was wondering what sort of task would it be to change the ignition and door locks. I have noticed on Ebay that you can buy ignition, lock and key, but some also come with the ECU. Is it necessary to change the ECU? and is this a major job or more of a plug and play? Many thanks for your time.