guidance notes on GM labelling guidance notes on GM labelling gyfarwyddyd ar labelu GM https://www.food.gov.uk/science/novel/gm/gm-labelling food.gov.uk. https://www.food.gov.uk/science/novel/gm/gm-labelling tabl ag enghreifftiau o ofynion labelu GMOs a awdurdodir labeled tabl ag enghreifftiau o ofynion labelu GMOs a awdurdodir