It could be the water. I don’t think it is, as I can’t believe that UK water is so drastically different than what’s going on in Germany, but it could be.

I described common English brands/types that mix well with milk. In the UK, when you say “tea” it’s immediately understood that you’re referring to black tee.

In Germany, “tea” is something else. Tea could mean fruit or herbs or black, it’s all on the same level there. Black tea is just another herb tee somehow to them