Self-service checkouts have been a feature of food retail stores for a decade or more but their use remains a subject of debate. The UK is a market where the technology is well-established and now Waitrose has decided to use the tills across its estate. Dean Best talks to Ed Brindley, marketing director for Waitrose self-checkout supplier Wincor Nixdorf, about the deal, the technology and where self-service could be heading.