Upon the death of her father in 1975 without a son, Lady Anne Fitzalan-Howard (as she then was) as the eldest daughter inherited the Herries of Terregles title, a Scottish Lordship of Parliament, and became the 14th Lady Herries of Terregles.
From 1975 until the reform of the House of Lords in 1999, Herries was eligible to sit in the Lords but chose not to do southern
The dukedom and the 16th duke"s other titles passed to his heir male, Miles Fitzalan-Howard. Herries operated as a racehorse trainer for over thirty years from the Angmering Park estate, on the South Downs, near Arundel, Sussex. She also had success in the King Edward VII Stakes, Great Voltigeur Stakes, Coronation Cup and Grand Prix de Saint-Cloud with Sheriff"s Star.
She trained fewer winners in later years, but her 2014 record of seven flat winners had been one of her highest for several seasons.
The most notable horse she trained was the Racing Post Trophy and Prix du Jockey Club winner Celtic Swing, who was crowned the champion two-year-old of 1994. Amongst her other notable horses was Taufan"s Melody who won the Caulfield Cup in Australia at odds of 66–1 in 1998, while she won the Wetherby Pattern Chase, Eider Chase and Rowland Meyrick Handicap Chase with Secretariat Point in the 1970s.
