In the UK, House of Lords reform is often characterized as unfinished business: a riddle that has been left unanswered since 1911. But, rarely can an unanswered riddle have had so many answers offered, even though few have been accepted. Indeed, when Viscount Cave was invited in the mid-1920s to lead a Cabinet committee on Lords reform, he complained of finding 'the ground covered by an embarrassing mass of proposals.' That embarrassing mass increased throughout the 20th century. Much ink has been spilled on what should be done with the upper House of Parliament; much less ink has been...