Try e bay there is somebody on there that sends you the code for �2 but I cant think of his username now.
You have to send him the serial number of the radio so you will have to get the special prongs to pull the radio out �1.99 of e bay again and then he gets the code from the serial number and I have done it as well.
Oh sod it its much easier to go to a ford main dealer or even a car accesory shop and they will do it for you for a tenner