Morrisons, Sainsbury's and Asda are importing meat from countries with lower animal welfare standards such as Australia, Poland and Uruguay, according to the National Farmers' Union.

Grocers turning to Australia, Poland and Uruguay for meat, prompting claim they are undermining British farmers

Morrisons, Sainsbury's and Asda are importing meat from countries with lower animal welfare standards such as Australia, Poland and Uruguay, according to the National Farmers'…