R40MGF created a new topic ' High idle issue' in the forum. 2 weeks ago

The m.o.t is due and we have a problem. 
Problem is that the car starts and runs fine but after the initial warm up the revs seem to hang at 1k and the radiator fan cuts in really early. 
I have had a search around and it seems to point to a problem with the coolant temperature sensor. 
Is this the most likely cause or could it be a stuck thermostat?

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