Much of the fruit and vegetables in UK supermarkets contains potentially harmful pesticide residues, campaigners warn. The supermarket chain Somerfield chain came out worst in the Friends on the Earth study, which showed 60% of its fruit and vegetables contained the residues. [other supermarket chains covered: Morrison's, Waitrose (part of John Lewis Partnership), Asda, Sainsbury, Tesco, Safeway, Marks & Spencer]