The system is working I think,
I am shielding, having had NHS letter, I get the government food box weekly, and Sainsbury's, Tesco, Morrison's, Asda and Iceland have all texted or emailed to offer me priority slots on home delivery.
I have chosen Sainsbury's as that is who I usually shop with, have had a delivery on Monday and will have regular Monday slot for the foreseeable.
I have requested my gov food box now goes elsewhere, to someone who may be still waiting for a priority slot with the supermarkets.
The boxes are very good, varied and over 20 food items plus household stuff.