I had to get the AA out after stopping at cash point . Car would not open via my key . Puzzled the AA man . He had a meter thing for tests and my car was picking up some signal that locked the central locking . He had to break into car to unlock it moved the car to another point and it was fine . Key would not open lock manually as obviously that had Been changed at some point and never got that key with car . No damage was done to my car even though he had to break in .now make sense of that .