Officers pursue a fleeing Vauxhall Astra through the streets of north Hartlepool at more than 100mph, but are forced to call the chase off and the driver later robs a supermarket at knife-point, sparking a huge manhunt. Liam and his sniffer dog take part in the search of a house that uncovers thousands in cash and nearly £500,000 in class A drugs, while firearms officers rush to Guisborough at 11pm on a Friday after a caller claims that a man with a shotgun is walking around the town