Age: 58 years.
'Foolish' Idea: A wheel-nut lock, which stops wheels coming off trucks.
The Story: A lorry driver, Roger, knew that at least 10 people die every year when stray wheels come off trucks, crashing into oncoming traffic.
His lifesaving wheel-nut lock, prevents wheels coming off. The invention has been taken up by distributors, Kellett (UK) Ltd.
Earnings: Roger should make £50,000 a year in royalties.