Been back to the Ford dealers today.

A nice type chap came out to have a looksee.
His words were, "I am not sure" and starts playing with the heater controls.
He is still not sure but says he THINKS that the 'stop start' will NOT work with the heater on.
I sussed this yesterday by accident, to have the stop start working, no heater.

Come on guys, suss this for me please, that surely cannot be right.