It may be that a connection has come adrift (perhaps behind the dash panel) which, in itself, is a difficult job. It may be best to go to your local Ford dealer to speak to a mechanic and see if they know what the fault may be.

Failing that you could contact Ford UK and pursue them (given that your car has been dealer-serviced) requesting sympathetic warranty repair on a car that is only four years old. You will have to be strong in your negotiations, but it is worth a try and sometimes gets results.