Doesn't the fact that she had to resign point to the opposite conclusion, namely that these governments are distinct entities with sometimes conflicting interests?
At least from an outside view, it's the UK now that is showing a good leadership in the current worldwide crises. While the US, France and Germany are completely lost, especially on how to deal with a "strong-man".
(Meanwhile nobody remembers Cameron or that guy that was a pure puppet of the US in the forced Iraq war, and they were the posh gentleman everyone was expecting)