Allied Bakeries has resorted to new packaging for Kingsmill products being produced at its Orpington plant in order to prevent instances of sabotage, which have dogged the site since last summer.
Last week the Food Standards Agency said that despite a police investigation, which was launched last September, incidents of tampering were continuing. A spokesman for the Metropolitan Police revealed that the latest incident occurred on January 25, when a fragment of glass was discovered.
The tamper-evident packaging introduced this month has a specially modified seal, which makes it easier to see if the bag has been tampered with.
Last year, sewing needles, glass and chewing gum were found in bread, prompting Allied Bakeries to inform the FSA and the Metropolitan police. No arrests have yet been made.