Update
Just thought I would update the thread. I have replaced the fan sensor which has cured the fan issue. Also replaced the thermostat although it tested working ok once the fan was sorted and I drive it the temp gauge was going down. Symptoms of thermostat stuck open. Now the gauge stays where it should be. Hasn't boiled the water again so my theory is maybe it was stuck closed and freed up when it was taken out to test.
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