The former Roydon Lodge principal bred, owned and raced many top horses, including Roydon Glen, Sundon, Game Pride, Smooth Fella, Scottish Command, Jay Ar, Bonnie Frost, Captain Adios, Castleton's Pride and Garcon Roux.
The son of Sir John McKenzie, founder of McKenzie's chain stores, was patron of the Outward Bound Trust, and was involved in many other community initiatives. His knighthood came in 1989 when we was regognised for services to education and the community.
Sir Roy wrote the book "The Roydon Heritage" in 1978, about the stud founded by his father and which he oversaw since 1955.
He is survived by his wife, Shirley, and three children.