The Motorway Cops: Catching Britain's Speeders - Season 3 Episode 7 -

PCs Chris Swash and Rowan Burt pursue a vehicle through the streets of Chester and have to continue their chase on foot through muddy fields when the driver runs off after stopping his car. PC Ian Cosgrove attends a serious crash on the M6 involving two cars and an HGV and must carry out breathalyser tests on all drivers to find out exactly how the accident happened