Dispatches investigates the five billion pound British sandwich industry and reveals what’s really in the nation’s popular ‘lunch-on-the-go’. Sandwiches from some of the top retailers are submitted to scientific analysis to reveal their nutritional values with surprising results, and undercover filming uncovers shocking conditions inside one factory.

Reported by Channel 4 News presenter Alex Thompson, the investigation reveals the huge amounts of salt and fat inside some of the best-selling sandwiches and how many of them bulk out their fillings with unexpected ingredients.

Monday 28 July 2008, Channel 4