1969 Vienna Convention on the Law of Treaties 

The edit summary restoring mention of "Great Britain" (which is an island, not a state) to the page doesn't address the actual issue: The present wording of the article asserts that Canada and the UK are signatories to the 1969 Vienna Convention on the Law of Treaties. Perhaps they are, but why is the UK's siging on to this treaty of importance to this article? Even the constitutional documents mentioned are now fully within the control of the Canadian parliament.