A large proportion of food sold in Britain as organic or as health-food contain traces of genetically modified (GM) ingredients, according to a University of Glamorgan study.

Professor Mark Partridge and Professor Denis Murphy tested 25 products containing soya, using a European Union (EU) approved technique for detecting GM residues.

They discovered that ten samples tested positive for GM ingredients, even though eight of these foodstuffs had been labelled "organic" or "GM free". Indeed, four of these products had GM traces exceeding Britain's Soil Association limit for organic food, for instance, 0.7% of a vegetarian sausage mix was GM soya.