Deleted here as requested by poster.
My Sainsbury's has instituted a maximum number of customers in the store and a queueing system outside
They are doing the same at our Tesco Extra this morning and Morrisons but our normal Tesco just had a flow system - no queues. We will try again tomorrow when it's Oldies Hour
They have adopted the Continental system of one in when one is out - they do it by using the trolleys. I couldn't stand in the queues for the time required