Gilbert spent the next 20 years on the Churchill project, publishing a number of other books throughout the time. Each main volume of the biography is accompanied by two or three volumes of documents initially called Companions, and so the biography currently runs to 28 volumes (over 30,000 pages), with another 3 document volumes still planned. Michael Foot, reviewing a volume of Gilbert's biography of Churchill in the "New Statesman" in 1971, praised his meticulous scholarship and wrote: "Whoever made the decision to make Martin Gilbert Churchill's biographer deserves a vote of thanks from the nation. Nothing less would suffice."