Hi, I had similar problem. put key in barrel and turn to position 2, remove plastic cowel cover and you should see a small hole, in the ignition casing, at the top. Using a small thin bladed screwdriver, push this pin while pulling the barel and key. ( this is the barell release pin ). I had to replace the barrel. this is a ford main dealer part. They will build it to your key from a kit. mine was £54.00 all inc. refitting is the reversal of removal. hope this is helpful.
tony
January 2010