When food goes off, unpleasant colour and smells warn us that we shouldn't eat the food. Irradiation masks these vital signs. And good food doesn't need irradiating. Food irradiation will allow food production to be shifted increasingly to the developing world, as extended storage times and delayed ripening and decay will allow foods to be transported further, from wherever is cheapest, benefitting multinational food production and shipping companies. There's a little red tractor that's appearing on food labels, which is a National Farmers Union logo for their British Farm Standards scheme of consumer assurance that the food is of the 'highest standard' etc etc 'with the interests of livestock and the environment in mind' blah blah.
Foreign products can carry the sign.
Tractor food can be irradiated. There is no stipulation about excluding GM foods. GM ingredients are allowed in animal feed. Most hormones, including BST, would no doubt be allowed if it weren't for the fact that they're banned at present. As for the environment, it seems that strict environmental rules would clutter the farm assurance standards unduly, according to the Royal Agricultural College.