This video from Britain says about itself:
Undercover inside the chicken factory
28 September 2017
A Guardian/ITV News undercover investigation into conditions at a chicken processing factory that supplies Britain’s major supermarkets reveals hygiene failures, manipulation of slaughter dates and repackaging of returned meat. The 2 Sisters plant in the West Midlands supplies M&S, Sainsbury’s, Tesco, Aldi and Lidl with pre-packaged chicken meat.
From daily The Guardian in Britain, 28 September 2017:
UK’s top supplier of supermarket chicken fiddles food safety dates
Firm supplying Tesco, Sainsbury’s and M&S may have duped customers into buying out-of-date meat, Guardian/ITV News investigation reveals
See also here.