I want to know the answer to the following question:
What country's government, on which the US government was modeled, did not formally implement separation of powers?
All the background I'm provided with is that "Strict separation of powers did not operate in The United Kingdom, the political structure of which served in most instances[citation needed] as a model for the government created by the U.S. Constitution.[citation needed]". Is that enough to answer the question?
Answer: no