Non scientific study of 3 supermarkets visited in past 10 days.
Sainsbury's - approx 35% of customers in masks. No staff.
Tesco - approx 20% customer in masks. One staff in homemade mask.
Waitrose - approx 60% of customers in masks. 20% of staff, including one in full perspex face shield and a dedicated person spraying trolleys and baskets with Waitrose No.1 brand gin.