Ceremonial maces in the United Kingdom carried by the Yeoman Usher of the Black Rod and placed behind the Lord Speaker on the Woolsack before the House sits. All members are required to bow their heads to the mace upon entering the chamber. It is absent when the monarch delivers his or her speech from the throne at State Openings of Parliament. The other mace accompanies the Lord Chancellor on official duties outside the House of Lords. Mace A was made in the reign of Charles II , is long and weighs . Mace B was made in the reign of William III and Mary II
Judicial functions of the House of Lords continued to come before the House of Lords in a similar manner. An Appellate Committee, normally consisting of five Lords of Appeal in Ordinary or Lords of Appeal, heard the actual appeals. The minimum number of Law Lords that could form a Committee was four. Seven Lords could sit in particularly important cases. On 4 October 2004 a Committee of nine Lords, including both the Senior Law Lord Lord Bingham of Cornhill and Second Senior Law Lord Lord Nicholls of Birkenhead, was convened to hear challenges to the indefinite detention of suspects under the Anti-terrorism, Crime and Security Act 2001,