Episode 5

Officers uncover a disturbing trade in counterfeit airbags that are putting the lives of UK motorists at risk. Unlike factory-fitted airbags, these airbags won’t work properly in the event of a crash. They either fail to inflate – or they explode.

In a crackdown on rogue landlords, environmental health officers make dawn raids on properties where people are thought to be living in overcrowded or dangerous conditions. And in Nottingham, there's a race against time to discover the source of an infection that has already affected 160 people.