Firstly, I must say that I've worked here twice (for a total of 5 years), so I'm a little biased! However, we have worked hard to make Single Step the kind of shop where people would want to go.
They check their suppliers regularly to ensure there are no GM ingredients, that everything is vegetarian (preferably vegan), etc.
A great place to go for general groceries, snack bars, pasties, etc. Plus, homeopathic and alternative remedies, loose (and therefore very cheap) herbs and spices, alcohol, greetings cards, vegan ice cream, plus a large selection of alternative, gay/lesbian, green/ecological, political and other magazines.