so I went to a garage. They stripped out a control unit from in the dash board and found it absolutely dripping with water and green and furry all over from where its been wet for a while. Apparently ford know about this issue and the water comes from condensation from the AC. New unit has been fitted which the garage tells me has been redesigned by ford to stop the issue happening again.
all in all over £500 to fix!! not pleased as its a known fault! shorly this is the sort of thing that a recall should of happened for?!