The House of Lords heard criminal law appeals from England, Wales and Northern Ireland.  Same jurisdictions for civil law, with the addition of Scotland.  Another leading British decision  - rivaling Woolmington v DPP in fame - was Donoghue v Stevenson, the cornerstone of negligence law (the snail in the bottle of ginger beer case).  It came to the House of Lords through the Scottish Courts of Session.

You are, however, correct that Viscount Sankey's famous speech starts off: "Throughout the web of the English Criminal Law one golden thread is always to be seen...."

Is this going somewhere, duali, or just a bit of Saturday night whimsy?  ;-)