In this episode, we see the terrifying moment a couple are confronted by three masked men trying to steal the catalytic converter from under the car parked on the driveway outside their Bristol home. One of the men, armed with a power tool, charges at the couple, but they stand their ground and capture the incident on their smartphone.

Catalytic converter thefts like this are a growing problem around the UK. This programme, narrated by Rav Wilding, looks at the ways in which the police, tech companies and car manufacturers are working together to combat it.

We also see how police dogs in Cumbria are being fitted with high-tech cameras that transmit video using drone technology. Also, how new phone software is helping victims of domestic abuse gather evidence.