It's one of those things that's making a bit of a comeback. When I was a kid, everyone got their milk from the local milkman. Ten years ago, there was no milkman here at all, everyone went to the supermarkets. Over the last few years, it's crept back steadily, so I reckon maybe a third of my neighbours now get milk delivered. The other thing that's getting more common is vegbox delivery. Local farms send you a box of assorted fruit and veg according to the season, for a fixed price. You can stipulate things you don't want, and quite a lot of the boxes are organic produce. There are at least two such schemes delivering here.
I reckon a milkman who came round with a horse and cart would do a roaring trade. I would pay just for the pleasure of seeing it. Last horse and cart we had here was "rag and bone" and that was decades ago. Now we get dodgy looking blokes in flat bed trucks scavenging - and one lot swiped two iron bench ends off my front patio!