Churchill reveled in answering questions from Parliament. He was remarkably skilled at doing so, as exemplified when he was accused of keeping inconsistent views. He simply responded: “My views are a harmonious process which keeps them in relation to the current movement of events.”
Churchill, it appears, took the view that the mind is not infinitely expandable. Time and again, he exhibited vast gaps in economic and financial knowledge. His salvation was that he studied when he had to, and kept close knowledgeable friends to fill in the gaps. When it mattered, he sought out what he needed to know.
As far as we can tell, there are no examples of Churchill criticizing British politics in speeches abroad. It is sometimes argued that criticizing one’s country is a sign of strength. Refraining from doing so, even if criticism is warranted, is a sign of greater strength. Churchill offered many apologies for British actions privately, when warranted, including overseas, in the course of World War II—but not in public forums.