She trained at the Bristol Old Vic Theatre School and first came to attention playing the lead in a television dramatisation of Barbara Taylor Bradford's A Woman of Substance (1985) and the film Local Hero (1983).
Again at the Lyric Theatre in 2002 she played the title role in Somerset Maugham's The Constant Wife, followed by a revival of David Hare's The Secret Rapture in 2003, and The Night of the Iguana two years later in 2005.
Coming to the West End from a UK tour, she played Leslie Crosbie in Maugham's The Letter at Wyndham's Theatre (2007), again co-starring with Anthony Andrews.
[2] In December 2007, she played Marion Brewster-Wright in the Garrick Theatre revival of Alan Ayckbourn's dark, three-act comedy Absurd Person Singular.
[6] Seagrove starred alongside Rupert Everett in the Academy Award-winning short film A Shocking Accident (1982), directed by James Scott.
Roles in a number of films including Savage Islands (aka, Nate and Hayes, 1983) opposite Tommy Lee Jones and Appointment with Death (1988) followed.
In 2017, she played the lead role in Another Mother's Son, starring as Louisa Gould, a member of the Channel Islands resistance movement during World War II, who famously sheltered an escaped Russian slave worker in Jersey and was later gassed to death in 1945 at Ravensbrück concentration camp.
Seagrove starred in two American-produced television miniseries based upon the first novels of Barbara Taylor Bradford: as Emma Harte in A Woman of Substance (1985) and Paula Fairley in Hold the Dream (1986).
As the female lead, Melanie James in the film Magic Moments (1989), she starred with John Shea, who played the magician Troy Gardner with whom she falls in love.
It aims to "provide sanctuary and relief from suffering for horses, while promoting humane behaviour to all animals and mutually beneficial relationships with people who need them.
[16] She was able to secure land on Monkshatch Garden Farm and has since grown the charity which today cares for over 30 horses using a unique system of equine welfare.