*Problem Resolved*
Took the car (with the new 2nd-hand roof ECU) to Cayman Auto Services in Dorking at the weekend - he read all the codes and re-sync the windows. Finally the roof now works! Just in time for the snow to arrive!
Just need to get the rear coil spring sorted & the front bearing re-greased, then i can fold away my cheque book for a while...
I would be more than happy to share my experience with anyone that has a similar issue. One thing i'm still not clear on however, is reading the codes. I followed all the instructions, but i was obviously not doing something correctly, as the indie was able to sorted it...
What would be very useful; is if someone could video how to read the codes and post it on YouTube.