Why don't they designate the day of the week you can shop by the letter of your surname. So A-D shop on a Monday, E-H on a Tuesday etc through to Friday. Saturday could be for front line NHS/essential, Sunday for elderly. They would know this by name on credit card. National scheme for all supermarkets. Well publicised. People turned away at door if wrong day, PA announcements in store for any that have slipped in. No exceptions otherwise word will get round that it's not being policed.
Doesn't apply to corner stores/mini stores.
What do we think?