direct to your inboxSupermarket shoppers are always keeping an eye out for the cheapest retailer out of Asda, Tesco, Aldi, Sainsbury's, Morrisons and Lidl.The latest results have now been revealed, and it's a tie between two supermarket giants.Lidl and Aldi have topped a Which? investigation to find out the UK's supermarket, with a total average basket price of £18.45 each.On average, shoppers last month would have paid £18.45 at both Aldi and Lidl for 19 essential grocery products.Included in