I'm gutted that our Sainburys local in Streatham Hill, which had the most friendly staff you have ever met, has just been converted to self-service check-outs. After several very stressful experiences in other self-serve stores, including twice abandoning shopping baskets and going home, and once inadvertently shoplifting two packs of knickers, I am never going to shop in them again. Will anyone else join me in boycotting these supermarkets until they take note that mums want people, not machines?