They are called Argos.
http://girlinlondon.com/argos-inside-one-of-the-uks-most-pec... for a good description.
You went into the local grocers which had a counter/hatch (think post office/bank), You told him what you wanted (or he your weekly order) and he (or usually his boy) would then drop the merchandise off at your house.
The Supermarkets pretty much paid to your corner grocer (economies of scale, later opening hours, more variety of items, the ability to do your shop yourself as and when needed and the increasing wealth of the UK (cars and refrigerators)).
It would be amusing if we went back to a high tech version of that.
Someone has already picked up on the "micro-mall" phrase. They're running a store where merchants rent display space, and they handle the cash registers and stocking for them.
http://thevillageindoormarketplace.com/become-a-merchant/mic...