To save any confusion, what are the main components of the electrical system. The way I understand it (probably wrong) is there is an ECU which plugs into the engine wiring loom. The ECU is also connected to the 5AS security box? Do the ECU and 5AS need to be synchronised to work together or will any ECU (be it an MGF one or a ZR160 one) work with any 5AS? Is it the 5AS which needs to be synchronised with the fobs? If so this website may be useful
http://www.alarmremotes.co.uk/new_page_4.htm
If someone could answer those questions in turn I think it would be very useful.
Nat, did the seller say that the 5AS/ Fobs/ ECU would be provided in the sale?