Scan-and-pay isn't a new concept inside Britain's major supermarkets, but Sainsbury's is keen to ensure it plays a key role in its shopping future. The grocery chain today announced that it will soon begin trialling a new shopping app that's designed to cut down the time spent doing the weekly the shop. According to Sainsbury's, the app will let customers fill their baskets using their phone, guide them to the in-store location of their chosen products, and then let them scan and pay. Everything is handled inside the app, which skips the checkout to reportedly cut down bagging and payment time to "seconds." Although Sainsbury's has also teamed up with Zapp to let you pay at the checkout using your mobile from early next year, a spokesperson tells us that the two payment systems will be independent of each other. The supermarket says it will begin trialling the system with its own teams in the coming weeks, before rolling it out to Nectar cardholders sometime in 2015.