Constitutional Reform and Governance Bill

I am grateful to my hon. Friend. He will know that I do not normally encourage him to go on longer than he feels that he wants to, but I seek his view on one matter. He has made an important point about memorandums of understanding falling outside the definition of a treaty. He also said the same thing about missile siting agreements. However, on the face of it—I am not an international lawyer—the definition of a treaty in clause 28(1) would include a memorandum of understanding, if it is""a written agreement…between States or…international organisations, and…binding under international law."" I ask myself why, if a memorandum of understanding is binding, does it not come within the statutory definition of a treaty? I would welcome my hon. Friend's guidance.