The environment secretary is due to meet the Food Standards Agency, food suppliers and retailers on Saturday to discuss the horsemeat scandal after Aldi became the latest supermarket to confirm its withdrawn beef products contained up to 100% horsemeat.

Owen Paterson said it was unacceptable that consumers were mis-sold products, but that the problems originated overseas.

"We believe that the two particular cases of the frozen burgers from Tesco and the lasagne from Findus are linked to suppliers in Ireland and France respectively. We and the Food Standards Agency are working closely with the authorities in these countries, as well as with Europol, to get to the root of the problem," he said.