When ordering a latte from a British caff, remember that their unit of measure for barista-applied sugar is much larger than the little packets you get at specialist coffee shops.
Side note
When you put a teaspoon of instant coffee (even if it does taste “so smooth you can’t tell the difference” (from what? Oh, that’s right, from real coffee)) in a mug that still has just a little bit of water in it, the amorphous pile of muck that emerges can look so vile, so evil, that pouring the scalding-hot water over the top almost seems a mercy.