I only shop at Sainsbury's occasionally, mainly for non-food items, so I've never bothered with a nectar card. Last time I looked it didn't seem worth it for the hassle of carrying an extra card and the loss of privacy in having my shopping habits tracked. But I know these things evolve - Tescos has started doing significant discounts for its loyalty card holders recently, so maybe Sainsburies does the same Can anyone summarise the benefits for me?