http://gmoaction.org/british-supermarkets-gmo-soya-and-birth-defects/#more-563
Over the last year the UK’s six largest supermarkets have all quietly dropped their non-GMO feed requirement for poultry and eggs. Tesco, Sainsbury, Marks and Spencer, Morrison, ASDA and the Co-op are now selling chickens fed on genetically modified soya.
Few consumers are aware of the change, for the retailers are not labelling their products as containing genetically modified organisms (GMOs).
The Co-op and Tesco have also misled their customers by claiming that GM feed given to animals is not detectable in animal products. This is not true. Several research studies have found that GM DNA from animal feed is present in the milk and meat that people eat. This has been confirmed by the UK Government’s Food Standards Agency.