Sarah,
http://unlock-code.co.uk/index.php
Try this too, and you don't really need to buy the sterio pull out keys, as you can use a metal clothes hanger by snipping off two 6 inch straight peaces of the hanger then use a hammer to beat each edge of the metal strips. then bend them into a u shape, inserting them into the double holes on either side of the front of the sterio panel in order to pull it out enabling you to get the serial number.
Harry
http://unlock-code.co.uk/index.php
Harry, September 2006