I have about 30 biographies of Sir Winston S. Spencer.
Of these, I recommend 4 if one is keen to read up on WSC. Walking with Destiny by Andrew Roberts as it is the most recent, published in 2018 besides being an excellent one-volume life. Sir Max Hastings writes wonderfully on WSC’s record as a war leader.
David Reynolds gave us an excellent insight into the writing of THE 6- volume memoirs by WSC. Ramsden gave us an overview of why WSC is the Man of the Century.