I expect Trump knows. With investment and development there is at least 30 years indicated of life left. More with any new discoveries.
https://www.oedigital.com/news/500942-oeuk-there-s-enough-oil-gas-in-north-sea-to-fuel-uk-for-30-years-but-industry-needs-fiscal-certainty
https://www.eia.gov/international/analysis/country/GBR
This guy is Peter Hartcher, political editor and international editor of The Sydney Morning Herald and The Age.
He is just a journalist, not an economist. Lots of people have said similar abut the end of general American domination for years now.