Mate of mines had this fail on numerous occasions, fortunately all covered by the warranty.

I'm not 100% sure but there might now be an uprated one.

Anyway if your having trouble getting one from Ford, you might want to try Profile Automotive (Wolf/Code Red)

Profile House Unit 2,
Balmoral Trading Estate,
Stuart Road,
Bredbury,
Stockport,
Cheshire,
SK6 2SR

TEL: 0161 406 9797
MOB: 07725 618835
FAX: 0161 406 9292