For those who dont think there are patches try muscling in in some of the council estates up North.
Let me know when you try and i will come and watch lol.
It is definately a regional thing, mainly before window cleaners needed cars, you would just walk down one street and back up the other side cleaning all the windows in that particular street or estate, hence why it was called a round, Which you would defend to the death
The downfall of Milkmen over the years wasnt just supermarkets, but increased competition from more milkos muscling in.
Where i lived as a kid the there was 1 milkmen on the estate, 20 years on there was at least 5 or 6 for the same number of houses, bets are now that they have all gone.