Motorway Cops: Catching Britain's Speeders

Teenagers are suspected of trying to steal a moped

At Grimsby docks, Sgt Tom Elvidge races to catch up with teenagers suspected of being armed with a knife while trying to steal a moped. With no time to wait for back-up, he chases after them alone. PC Martin Leak pulls over a driver who admits to using cocaine at a party a few weeks ago, but is he telling the whole truth?