.scalding.hot.

next time you order black tea in london and you want milk in it, do not order it as "black tea" and then when they hand it to you, ask for milk (or white, as it's known here). they will look at you all funny, and say, 'but you ordered black tea. over here, when you order black tea, it means black tea.'

oh - and it's also usually scalding hot, so you'll have to let it cool before drinking it.