Keycode for Ford 6000CD Stereo?

[terrier_james]

I have a 55 plate Ford Focus, which I took the Ford (Visteon) stereo out and replaced with an Alpine iPod ready headunit. Now I am coming to sell the car on, I've put the standard 6000CD headunit back in and it's asking for the keycode, but the little credit card sized keycode card in the Ford folder is blank!

Can anyone help, please?

The serial number is M005925 and the part number is 5M5T-18C815-FA.

Thanks in advance!