When I asked a buddy who grew up in the UK what foods I should have his first response was milk. He was not wrong, it was delicious like the time I accidentally got homo milk instead of my normal choice of 1% -the UK milk was 1.25% and I can't tell any difference between 1 and 2% here-.
He did mention to try the chocolate there too so the next week I put 2 and 2 together and got the chocolate milk. It tasted like butt. My guess is that they don't jack it up with as much sugar as they do here.
Long story short you can tell the difference in milk, internationally