Back on home soil, he was entered in the Gimcrack Stakes at York in mid August.
But after a narrow win in the Coronation Cup at Epsom Downs, by a neck from Homeric, Mill Reef was found to be suffering from a heavy virus, and the rematch had to be postponed.
After his recovery, Mill Reef was trained for an autumn campaign and a return to the Prix de l'Arc de Triomphe in October.
Coventry Stakes (1970) Gimcrack Stakes (1970) Dewhurst Stakes (1970) Greenham Stakes (1971) Epsom Derby (1971) Eclipse Stakes (1971) K. Elizabeth Stakes (1971) Prix de l'Arc de Triomphe (1971) Prix Ganay (1972) Coronation Cup (1972) Mill Reef (1968–1986) was a Champion Thoroughbred racehorse and sire.
He was bred in the United States but was trained in the United Kingdom throughout his racing career which lasted from 1970 to 1972.
He was a son of Never Bend out of the mare Milan Mill by Princequillo.