The Co-Op has an ethical buying policy but apart from their selected special offers, their prices must be the most expensive in the entire country. Most Co-Op items, when reduced for quick sale, are still more expensive that the original price for fresh produce everywhere else. Yoghurt prices are so high that they are almost quite funny.
They do have one or two hidden gems though if you know where to look. Their own-brand Magnum look-alike ice cream lollies are superb value at three for £1, as are their own-bran choc ices, which they virtually give away.
Their online retail store, Co-Op Electrical, is absolutely brilliant, offering some of the cheapest prices you'll find anywhere and a delivery service that is unequalled (sometimes delivering within hours of placing the order).
I find it hugely annoying that they don't issue their points cards in key ring form, like those from Tesco.