Civil Jurisdiction (Offshore Activities) Limits - Civil Jurisdiction (Offshore Activities) 1987
The order divides United Kingdom territorial waters and waters within areas designated as part of the United Kingdom continental shelf (under the Continental Shelf Act 1964) into English, Scottish and Northern Irish parts to which English, Scottish and Northern Irish civil law is applied respectively, and confers jurisdiction accordingly on the High Court in England and Wales, the Court of Session and the High Court in Northern Ireland.
This is modified version from the UKHO Law of the Sea department data, available via https://www.gov.uk/guidance/inspire-portal-and-medin-bathymetry-data-archive-centre