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Legal Terms - customary international law
What could be referred to as the law of nations' "common law" It is made up of an extensive collection of specific regulations that represented the main body of *international law up until the turn of the 20th century. Until other states began to adopt the norms, the UK, a single state with the power to impose its will, was the source of many of these regulations, including those pertaining to maritime law. Other rules—most notably those pertaining to business transactions—were first adopted voluntarily by a limited number of states. Because they were deemed practical and helpful, other states eventually followed suit, turning the established practice into a legally enforceable regulation. As a result, customary law was by its very nature ambiguous. Because of this, black-letter treaties were increasingly used in the 20th century to replace customary law.
In the case of Trendtex Trading Corp. v Central Bank of Nigeria [1977] QB 529 (CA), Lord Denning MR made the declaration that, unless they are in contradiction with a parliamentary act, norms of international law as they exist immediately form a part of English law. Nonetheless, the House of Lords decided in R. v. Jones (Margaret) [2006] UKHL 16, [2007] 1 AC 136 that *custom is a source of English law that the courts may refer to as needed rather than being a component of common law. Their Lordships ruled that either the subject matter should have been discussed in Parliament, described in a statute, and enacted on a specified date, or English law should be founded on a previous English court decision. Additionally, without such statutory permission or earlier English

judicial ruling, the enactment of new legislation would be against a core tenet of our constitution.


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