The Supreme Court in London is only for England, Wales and Northern Ireland.
I can provide a citation if requested.
I should add that case law in Scotland is considered “persuasive” in England and Wales and may have been considered accordingly if some Judgment of relevance has been made there.
That may be the case for civil litigation and criminal matters but the UK Supreme Court is the Supreme Court for the whole United Kingdom for constitutional and similar matters. It's worth remembering too that this case arrived at the Supreme Court via the Scottish route.