All the UK supermarkets sell it. Price is about 50% higher, so it's not worth buying if you get through a lot of milk, but I doubt I'm the only one to use milk mostly as a flavoring for tea.

I wouldn't want to drink ordinary milk after it's been open for 14 days.

lactose-free milk does taste different, but i didn't notice a difference between regular lactose-free and protein-fortified lactose-free (aside that it comes in cartons just slightly visually smaller that adds up to a 12oz difference).

It's not popular in the US for mostly societal reasons, I think.

> which I can't imagine tastes the same

Fairlife tastes excellent. I switched for the extra protein as I'm a bodybuilder. I bought the 3.25% fat version at first because I love the silky mouthfeel of a whole milk cappuccino. Then I found the 2% Fairlife satisfies in the same way as 3.25%, with less fat calories, and froths up beautifully in the pitcher.

> They also appear to expire 9-14 days after opening which doesn't seem all that different from other milk with practice?

Anecdotally I think it's better. I've never had to toss one (but they are half gallons) while I find myself tossing sour regular milk frequently.