Today's test - 15 mile blast up and down the A329M from cold. With the problem this would have lit the overheating light (120 degrees) at about 5 miles, with the cabin heating off.
Today when the temp reached 89 it then began to decline. For the rest of the run it hovered in the range 85 - 89.
So I will let it get cols again and test again but I am quietly confident.
I don't think it's possible to fit the thermostat incorrectly so it would seem to be faulty, or at best inefficient. Maybe a good reason to only buy Ford parts.
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