Kenwood Kdc-w3537 In 03 Reg C3

[ABT]

Hi. I've just got an 03 reg Citroen C3 1.4hdi. It has the original radio/cassette in it. I'm wanting to fit a Kenwood KDC-W3537 head unit and CD changer into it. Would I need an adaptor to ensure the wiring still functions normally (central locking etc.) or do I try the new head unit first and see if anything goes wrong? If it does, does any reprogramming need to be done at A citroen garage or would buying the adaptor cure any problems if there are any? Can the adaptor only be bought from Citroen dealers? Does anyone know if the remote control stalk will work - on the rear of the head unit there's a wire to connect for 'remote control'? Any advice would be appreciated. Andrea.