In article , Nick Maclaren
writes

It lasted for quite a while after the war where I was, because the
fresh milk was unsafe (seriously so). Heat-dried milk lasted until
at least the 1960s in the UK, and there was a period when free-dried
was the expensive alternative.

By the time I started school in the late 50s we were on fresh milk. It
used to be delivered at about 4am, so in winter was well frozen by the
time the teachers arrived. They then ranged the 98 milk bottles along
the heating pipes, and by break time we were treated to warm milk (with
that yukky boiled milk taste) with a solid centre ;-)
--
Kay
"Do not insult the crocodile until you have crossed the river"