
When has this happened? - Whenever that shop has some sort of monopoly in a particular area.
Happily, such monopolies are now much fewer as the vast majority can easily reach a decent supermarket.
Some small butchers and fruiterers et al can still withstand the onslaught of the supermarkets - and they do so by working to a principal of quality which supermarkets are seemingly unable to match.
It is not just Mr Fearnley-Whittingstall who can taste the difference with meat, eggs etc.