Raised the rear of the bonnet using washers, and pulled apart the front clip to wash out the radiator properly, which despite being hit with the high pressure hose a few times at the car wash was still half full of mud!
Temperature now sits about 85-90 on the road, and didn't go over 100 even sitting idling for half an hour in the driveway.
The real test will be towing on a hot day, but so far, massive improvement!
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