The motoring journalist convinced Ronni that the M1 was Britain’s longest motorway, rather than the M6.
It meant Ronni, who was playing for charity, walked away with £1,000 after losing thousands of pounds.
Jeremy admitted he was “ashamed” of himself for the mistake and Piers quickly pointed out that he should have known the answer.
Jeremy Clarkson hosted Who Wants To Be A Millionaire? for three years – he replaced Chris Tarrant (Image: GETTY)
Jeremy Clarkson faced off with his former foe Piers Morgan on Millionaire in December (Image: ITV)
The Good Morning Britain star sniped that he got it right and he hadn’t “hosted a car show for 8,000 years”.