J Sainsbury will this week put pressure on Argos, John Lewis and Tesco when it starts selling home electronics, bathroom suites, home furnishings and sports equipment from its website.The UK’s third-largest supermarket is looking to vastly increase sales of its non-food ranges. Around 4,500 products will go on sale this week, rising to 8,000 products by September.The ranges will be made up of both branded and own-brand items, such as “Different by design” and the newly launched “Tu” range of homewares. The supermarket will also stock products from top brands including Sony, Apple and Le Creuset