The Supreme Court of the United Kingdom is the ultimate court for criminal and civil matters in England, Wales and Northern Ireland and for civil matters in Scotland. (The supreme court for criminal matters in Scotland is the High Court of Justiciary.) The Supreme Court was established by the Constitutional Reform Act 2005 with effect from 1 October 2009, replacing and assuming the judicial functions of the House of Lords. Devolution issues under the Scotland Act 1998, Government of Wales Act and Northern Ireland Act were also transferred to the new Supreme Court by the Constitutional Reform Act, from the Judicial Committee of the Privy Council.

Answer this question, if possible (if impossible, reply "unanswerable"): What body previously had judicial supremacy in the UK prior to this?
House of Lords