Hello, I hope I can offer you some assistance.
Do you have the facility to remove the unit? To obtain the original keycode you need the serial number of the unit, this is on a label on the unit but requires unit removal to see it. If you haven't got the facility to remove the unit the tools are http://www.ebay.co.uk/itm/Ford-KA-Puma-Mondeo-Car-Stereo-Radio-Removal-Keys-Tools-/370757713993?pt=UK_In_Car_Technology&hash=item5652e1c049
or you can try your local garage, they may remove it for you for free.
Once you have the serial number let me know it and I can obtain the code.