Well the Ford dealer just rang and said there's nothing they can do until more people complain about the same fault as Ford Technical say they have never heard of it.
My reply was that this is unacceptable as it is dangerous because at times it can be virtually impossible to keep the car in the lane due to zig-zagging between the white lines. This is to the extent that I had to pull over on a busy freeway to stop/start the engine.
They said their hands are tied, and unless I have an engine management light showing then there was no point in bringing the car in.
2 weeks old, and I have a lemon. Ford Customer service here I come.