Hi   I bought my C2 in November and wanted a new CD Player installed.   When I went to Halfords they told me that due to some of the electrics being fed through the stereo or something like that it was not a good idea to fit the new stereo due to it may affect the central locking and speedo etc.   I was glad of the advice given, too be honest and walked away with my money intact!    Hope you manage to get it sorted.