> what happened early 1943

Supposedly the better question is why it took so long for an allied victory. Britain’s economic output was absolutely vast, and its colonies made it very powerful. Yet it still took the US industrial capacity coming online and a significant portion of the USSR’s population dying before victory.

This book discusses it at length, it’s an interesting read. https://www.amazon.co.uk/Britains-War-Machine-Weapons-Resour...

Yes and then no (or not without US help).

The British empire outproduced, manufactured, mined etc the Germans for basically the entire war. The question is more about why it took so long for the allies to get the upper hand.

The idea of ‘the plucky underdog’ is a myth, Britain was very much a superpower with a massive, resource rich empire behind it.

https://www.amazon.de/Britains-War-Machine-Weapons-Resources...

I found David Edgerton's "Britain's War Machine) (http://www.amazon.com/Britains-War-Machine-David-Edgerton/dp...) quit interesting.

He highlights that the Germans---far from the technical wizards they are often portrayed as these days---won in the beginning despite inferior material. The British and their allies always had material and technological superiority. (Lots of their gadgets just didn't work very well at the beginning.)