[pip08456]

Originally Posted by BenMcr

Yes, that's when the whole island of Ireland was part of the United Kingdom and covered by English law. However:

https://en.m.wikipedia.org/wiki/Northern_Ireland_law

The Supreme Court is the highest court in the land for both criminal and civil appeal cases in Northern Ireland and any decision it makes is binding on every other court in the same jurisdiction, and often has persuasive effect in its other jurisdictions.