With a mini budget at his disposal, it's Gavin's job to pull together reconstructions, organising crew, cast, hotels, transport, props and all other elements on location to make sure the film is delivered safely and on schedule. That means being responsible for health and safety on the set, as well as making sure that every shot taken is carefully logged.

Crucially, he's responsible for making sure the digital rushes shot on the day make it back to base. "It’s a huge responsibility to look after those rushes," he admits, "because if we lose any of it, we wouldn’t have anything to show on the TV. We’d have to go back and film the entire reconstruction again."

His work doesn't end here, however, and transmission brings with it its own logistical challenges, including getting the numerous police detectives to and from the studio, and managing the crucial calls and texts from the public in answer to appeals.

It's hard work, but a job he relishes. "If someone was going to join Crimewatch, I suppose the advice I would give them is be aware it’s going to be hard," he says. "There’s a lot of long hours, but it will all be worth it at the end."