Use By Dates
Following a 2015 Supreme Court judgement, the Food Standards Agency have issued detailed guidance which can be accessed here.
The advice note advises that for Retailers there are no exemptions from the "Use By" date rules. For Caterers there are generally no exemptions, unless the products are to be used as an ingredient/changed from the original form, and subject to robust documentation and strict controls.
FSA Guidance - Use By dates