In London, Dom joins a team of DVSA inspectors who are stopping and fining drivers of commercial vehicles that could be putting people at risk. And Manchester traffic cop Matt Picton is called to a serious road traffic collision. Was the driver on their mobile phone?

Dom joins Enfield environmental crime officers Frankie and April as they investigate a massive fly-tip - and come across the remnants of a cannabis farm. And in Birmingham the London Midland Revenue Protection team hand out penalty fares to ticket dodgers and first-class-carriage abusers.