While investigating, they told the customer that the sausages were made in a part of the food plant where meat products are also handled.
Matthew tells Daily Mail: ‘Because they had the packaging they could determine that it was produced at night when they had a skeleton crew on. They pulled the people off the production line and interviewed them.
‘They reviewed CCTV footage and couldn’t find anyone planting anything and no one admitted it.’
However Matthew believes it was an act of sabotage and that one of the factory workers ‘must have popped the nugget in the package to prank a vegetarian’.
A Quorn spokesman confirmed to Daily Mail that it was feasible the nugget had been ‘introduced deliberately by a factory employee’ and said they’d been unable to find the source of the chicken despite reviewing CCTV footage.