Michael McCahill is an established expert on the House of Lords and this monumental tome is the product of four decades' work in this field. It has been published in a book series linked to the journal Parliamentary History, to which the author has been a regular contributor. It is not to be confused with a publication from the History of Parliament Trust, which its layout and approach most resembles (and whose survey volumes have in the past appeared as standalone paperbacks like this). Indeed, given that the latter is not due to publish its volumes on the Lords until later this decade, the appearance of McCahill's volume is especially welcome. And given that this is the product of one scholar's labours rather than that of a full-time project team, its achievement is doubly impressive.