Mr AA came, told him what had happened as in the first post. He plugged his computer in and came up with the fault no.u1900. He rang , but got no response as they only work 8-5 and he said that keep their faults pretty secretive and could not diagnose the fault because of this but was sure that it was a engine heating sensor. He reset the fault for me but the car mix is running with too much oxygen and the exhaust gurggles, so will take in to Ford on Friday as I'm on 12 hour days till Thursday