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Sorted. The boiler thermostat bulb was not clipped to the flow pipe inside the boiler casing. It was waving in the breeze about half an inch from the pipe so it was picking up radiant heat from the pipe and should have been in direct contact. If you have the same problem, have this checked...

Hi I have a problem with my Potterton Prima F gas boiler. The overheat stat pops out almost daily. I have turned the boiler stat down to almost off and it still happens. I ran the heating this morning and measured the flow temp from the boiler. It got to 82 c before the boiler stat shut down...