In the olden days, the English drank a ale because water was unsafe and could kill you. But the trouble with Ale is you get drunk and unproductive. This is no way to build the Empire.
Then tea was discovered to be safe alternative. (Boliing water killed off deadly germs) The added benefit was it was a stimulant that made you productive not drunk.
Add 2 teaspoons of sugar and some milk and it was an energy drink.
That's how the English invented the original power drink. Caffeine and sugar. Its still the recipe