Anthony Goodman (1936-2016) was an English professor emeritus of medieval and renaissance history at the University of Edinburgh. His main field of interest was late medieval England, and he published books on subjects such as John of Gaunt and the Wars of the Roses.
If you're interested in good coverage of the military aspects of the wars of the roses, this book gives pretty good coverage of battles, casualties, and results in its first two thirds and of the physical realities of the wars (equipment, supply, etc.) in the last third. It's a little dry, but it's well researched fills in the blanks left unexplored by Alison Weir's "The Wars of the Roses".