I'd be surprised if anyone in a rural area, unless they are in a really remote place, has a problem finding someone to shop for them. In my local area (two villages with a total of maybe 70 houses) we immediately set up phone numbers to call, all of us who weren't isolated volunteered, and those in isolation are being sorted out. The only complaint I've heard is from Barry - his shopper bought him a rather nicer bottle of red than he usually buys and it was delicious, so now he's hooked on the good stuff
I'd have thought towns and cities were more likely to have problems here - when I lived in London I knew only one person in my street, and that was a work colleague who moved in opposite me.