Which body serves as the final court of appeal for some Commonwealth countries?

The Judicial Committee of the Privy Council serves as the final court of appeal for several Commonwealth countries, particularly those that have retained it as part of their judicial system. This includes nations such as Canada, Australia, and several Caribbean countries. The Privy Council's decisions are not only binding but also provide a significant degree of legal consistency across these jurisdictions.

In contrast, while the House of Lords served as the highest court in the UK until 2009, it does not function as an appeal court for Commonwealth nations. The Supreme Court, established as the highest court in the UK, does not have jurisdiction over the appeal cases from Commonwealth countries that still utilize the Privy Council. As for the International Court of Justice, it deals primarily with disputes between states rather than serving as a direct appellate court for domestic legal matters within Commonwealth nations. Therefore, the Judicial Committee of the Privy Council is the correct choice as it holds the position of final appellate authority for certain Commonwealth nations.