Hi Guys,
Just joined and wanted to answer the original question.
I currently have 4x CPC464. Number one is original and unmolested. Number 2 is in bits. Number 3(a) was bought on eBay, repaired with bits from number 2 and resold on eBay, number 3(b) was bought on eBay, repaired with spare bits from 3(a) which would have gone back into number 2, and slightly modified so that I don't have to run another power line into the monitor to SCART lead. Number 4 is sitting, untested, and is waiting for me to build a new power pack and SCART lead, which will also serve number 1.
I only buy damaged or untested units on eBay.