Foodservice giant Sodexho has been forced to seek a High Court injunction on a Channel 4 documentary, to try and prevent the airing of a programme about subsidiary Tillery Valley Foods this Thursday.

The Channel 4 Dispatches programme claims to have uncovered more than 120 incidents of "unhygienic behaviour" at TVF's Gwent operation in Wales. But Sodexho believes the Peruvian reporter who worked undercover to gain the footage is unqualified to to test food and acted improperly. The company claims that the programme does not reflect working practices accurately, according to media reports.

TVF is the biggest supplier of food to the UK's hospital network. Managing director Michelle Hanson said: "An undercover journalist was discovered at TVF. He was suspended for serious breach of hygiene rules. The matter is in the hands of our solicitors. We produce 25 million meals a year. In 20 years we have not had a single incidence of food poisoning."

Dispatches apparently claims to have found traces of e-coli in samples it says came from the TVF facility.