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UK Government position December 2020
The UN Convention on the Law of the Sea – UNCLOS - is a critical part of the rules-based international system. Its provisions apply to 70% of the surface of the globe and form an essential component of global governance.
The United Kingdom is fully committed to upholding its rules and securing the implementation of its rights and obligations. This commitment is a common endeavour of the international community.
https://www.gov.uk/government/speeches/upholding-the-un-convention-on-the-law-of-the-sea
We are also signatories and have ratified the Convention in 1997
I'm no Philip Sands, but as I understand it, if it's not written into UK law that we will follow that convention, it doesnt matter what the UN says.