I have a Peugeot 205 I just recently bought and I am hoping to get a cd/radio for mine. Hoping I don't run into problems like your having....I got my MOT on the car nxt week, asking the guy at garage for help on changing the radio over to a cd player.
Goodluck finding your answer, but if I was you. Just nip down to your local garage, sure they be happy to help you out.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix in-car audio.