Kirk Eden, of Merseyside-based...

Kirk Eden, of Merseyside-based UK Fuel Guard, has borrowed the sound-chip technology to create a warning device designed to prevent diesel drivers accidentally filling up with unleaded - a costly mistake 300,000 motorists make each year.

Even if a motorist behaves...

Even if a motorist behaves perfectly legally and responsibly on the road, but is found to have purchased the vehicle through ill-gotten gains - drug dealing, people trafficking, that sort of thing - by all means let the authorities take away the wheels. Come to that, the yacht, the house in Marbella and the gold medallions, too.