Yeah and even when they did face the Nazis, the Brits were still using WWI tanks (or not much better), which were slow, got stuck easily, and barely offered any protection. They got lucky the Nazis chasing them to the coast were ordered to stop and that the citizens with boats used them to transport them back to the UK or WWII might have ended very differently.

And then the fact that they were on an island and were the head of an empire that spanned the world gave them even more time and resources to play catch up.

Hitler was also very upset when the Brits started bombing Germany instead of just focusing on dealing with the Luftwaffe bombing them.