This is extremely na ve advice which shows an almost total lack of understanding of market economics. The only businesses which remain competitive are those which are able to meet the requirements of their customers, and market research shows that consumers are deeply suspicious of genetically engineered foods, and many are willing to boycott their purchase. Surely by now the NFU must have grasped the basic economic reality that no industry can fly in the face of consumer preference and expect to survive.
Consumers know that genetically engineered food is still experimental and largely untested.
The long term effects on their health and the environment are completely unknown, and published research already shows that these products can be capable of producing unknown toxins. In one case in the United States a food supplement manufactured using genetically modified bacteria killed 37 people and left 1500 permanently disabled. That company is now defending law suits. The very nature of such technology is that it frequently incorporates genetic material which, in thousands of years of evolution, has never been part of the human diet. To claim that you can predict the long term effects of such radical change represents arrogance of an extreme kind.