In our school, Bagitha we had a radiator with narrow metal shelves fixed to the front of it. The milk (a third of pint each) was put on those to thaw and was tepid by the time we drank it. It tasted OK (though I have never been keen on milk as a drink ever since) but inevitable some drips must have got onto the shelves and the radiator, or perhaps the bottles were splashed while they were being filled, because there was a lingering smell of old milk clinging to the outsides of the bottles. It got onto your hands too.
The milk came from a local farm, who also supplied milk door-to-door. This was not in bottles, but was poured into whatever can or jug you had set out ready. It was paid for pro rata, but whenever the farmer's son was on deliveries, my mother reckoned she got about half-a-jug at full jug prices. She suspected he was making his own little profit.