coronavirus. In May, the Government announced that people should wear face masks if they're unable to maintain social distancing.A document said: "If you can, wear a face covering in an enclosed space where social distancing isn’t possible and where you will come into contact with people you do not normally meet.“This is most relevant for short periods indoors in crowded areas, for example on public transport or in some shops.”Since people have been using face masks while shopping in supermarkets, what are the official rules?Tesco, Asda, Sainsbury's and Aldi all have different regulations in stores.The supermarket giant hasn't made wearing masks compulsory for customers or staff, but they are available if people wish to use them.Tesco has.