17. Customary international law as international law.

17.     Customary international law as international law.

A rule of customary international law may be relevant in its quality as international law to the determination of statutory rights or obligations under English law. First, there is a presumption of statutory construction that Parliament does not intend to legislate contrary to the United Kingdom's existing international obligations, including those under customary international law1. As a consequence, where a statutory provision is ambiguous and only one of its possible meanings accords with customary international law, this meaning is to be preferred2. Secondly, the lawful application of a