They may be reasonable to get everyone to use them, and then they put the prices up! The couple of times I visited the local co-op in person, it was very quiet (no customers) and all the staff were scurrying around picking deliveroo orders.
Allergies add another dimension to shopping. It's good that you've found food that you can consume. It is still possible to have milk delivered here from a dairy. I used to have a milkman three times a week who left milk in glass bottles and collected them again at the next delivery. He retired last winter, his message said that someone else was taking over. There are a couple of farms that sell organic milk and one, I think, that sells unpasteurised.
Happy New Year 🥳