"This milk's gone off" is a common expression on this side of the pond - well, not as common as it was before refrigerators became a standard item (rather later over here than over there). We also say "this milk has turned", presumably sour.

My own dislike of sour milk flavour also prevents me from using long-life milk, sterilised milk and evaporated milk. They all taste bad and flavour anything with which they are made. Cream and butter taste similarly rancid to me.