An update to my post yesterday. My kitchen fitters were back today for a different issue and we all tried the grill and couldn't get it to work. The oven was fine. I was just about to report the fault but remembered the 'IT Crowd' advice: 'have you turned it off and on again'. I switched it off and on again at the master switch and the grill now works perfectly. One observation; I still get loud clicking noises when it's in dual mode, but not when it's in full mode.
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