We don't have milk deliveries round here, but my elderly father does in rural Cambridgeshire.

He can also buy lots of other groceries and essentials from his milkman - Dad rings me, I order online and it's delivered within 2 days. Payment by online invoice once a month by DD or debit card.
https://www.milkandmore.co.uk/

Saves him a lot of hassle and he gets to talk to someone different 3 times a week.