Tesco has introduced a rationing system in its supermarkets, limiting customers to three items only for certain popular groceries.The purchase limit includes loo roll, pasta, eggs, soap, nappies and baby formula, among other products.A yellow sign was snapped over the toilet paper at a Tesco in Cambridge, which read: "To help give everyone access to essential items, these products are limited to 3 per customer."At another shop a blue sign limited antibacterial hand wipes to just one per customer.The supermarket giant said in a letter it was introducing the temporary cap on certain "essential" items to "help all customers have access to these products", the Mirror reports."The extra limits are just pre-emptive measures to help us smooth.