I've read the advice on how to get the old one out, but how do you put a new radio in without leaving bare dash visible? Can you buy covers from anywhere that will fit around the standard shape/size cd/radio?
Halfords sell a facia panel for the KA for around £20:00. See http://www.halfords.com/opd_product_details.asp?id=17461&type=0&cat=46 for a silver one. You may also need adaptors for the electrical and aerial connectors. Halfords also do these. Don't know where else may do these.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix in-car audio.