As of July 19th we decided to allow one customer at a time (or a small "bubble") inside the shop to browse and choose their own shopping from the shelves. Our shop is quite a small space and mainly staffed by volunteers, and we decided last year to serve customers at a table across the doorway to help protect both them and us. Hand-washing facilities are available outside the shop, hand sanitiser at the entrance, and we will continue to wear our masks - we politely ask that anybody entering the shop does so too. Customers without masks can still be served at the table as before.
Many thanks to everybody for helping us with this.