When did the British Empire become the best Western Power?

If talking about any time in history. It could be the Industrial revolution when they came up with the cotton gin and steam power. The coal fields and resources they had at their disposal. Also their naval and oversees powers made their capitol rise. There was a Spanish king/prince who attacked the British with his naval army only to have it destroyed making the British the best naval army.

Nadir shah of persia invaded india and looted their booty , so the British thought india must be worth it , and that my friend , let to their eventual downfall