Jen and her dog Quantum search for a dangerous suspect who has form for assaulting police, while a crackdown on cannabis cultivation leads to a big haul in a disused warehouse. On the roads, a van with false plates causes complete carnage, ploughing up the pavement and getting wedged against a house.

Lisa and Jim find themselves slipping and sliding through muddy fields as they go off-road in pursuit of a 4x4, while routine stop by the knife crime team leads a garage full of cannabis estimated to be worth tens of thousands of pounds. Meanwhile, Dan and Spence seize a Ford Focus apparently purchased at 1:00am, and an unlicensed 17-year-old driver folds under Rob's questioning.