In our timeline, the British became the most powerful Empire the world has ever seen, controlling 13 million square miles, nearly 500 million people and the world's oceans. This came as a consequence of natural advantages, as well as artificial factors. The artificial factors were sometimes based on the natural advantages, or on other artifical factors that had become engrained.
But what do you feel were the best "breaks" that put England/Britain on a higher trajectory than you would have expected from the context twenty years earlier, based on your knowledge of alternate history's cause and effects?
This should balance the probability of it happening and the impact of it. So something that had, say, a 60% chance of happening but had a hugely beneficial impact counts as much as something that had only a 30% chance of happening but only had a medium impact.
I would prefer to focus on larger scale events like the Glorious Revolution and the Seven Year's War rather than niche PODs like particular battles...
I hope this makes sense.