Where can I get the correct Ford Focus Radio Keycode?

I have a Ford Focus and cannot get the CD (Unit Type is FD 600A) etc to work after the battery went flat and had to be recharged. I have a key code on the manual but it would not accept the code and it kept locking me out. I tried pressing the keys 1 & 6 on the radio together to try and get the serial number, but the code I got was 50700012 which is not in the right format for the serial number.

From a post somewhere or other, I found the suggestion that non-Ford second-hand salesmen often give out the wrong manuals when they have more than one Ford in the garage, so I struggled and got the radio out of the mounting. Sure enough the serial number was completely different to the one on the manual.

The correct serial number is M625512. Would anyone be able to give me the correct keycode for this serial number please?