Last week the confectionery giant recalled Cadbury Dairy Milk Turkish 250g, Cadbury Dairy Milk Caramel 250g, Cadbury Dairy Milk Mint 250g, Cadbury Dairy Milk 8-chunk, Cadbury Dairy Milk 1kg, Cadbury Dairy Milk Button Easter Egg 105g and Cadbury Freddo 10p.
It said that the recall was a precautionary measure because some of the products could contain minute traces of salmonella.
However, Herefordshire Council has launched an inquiry to investigate circumstances surrounding the contamination incident at Cadbury's factory in Hereford.
Andy Tector, Herefordshire Council's Head of Environmental Health and Trading Standards, said: “We're working closely with the Food Standards Agency. Officers have already visited Cadbury's Marlbrook site.”
He added: “One of the lines of inquiry will include establishing when the company first discovered the outbreak. However, we cannot prejudice the investigation by commenting further at this stage.”