[ch4s3]

Milk is in the back because they have to maintain the cold chain, and the refrigeration is in the back. Putting it anywhere else risks spoilage if a pallet takes too long to unload or gets left unattended.

[brexitzzzz]

Try shopping in the UK.

None of the big 4 supermarkets near me have milk at the back. In fact IIRC they are all in the middle of the store.

[ch4s3]

Well, they're missing out on some opportunities to keep their products cold from production to purchase.