She has composed around one hundred works which have been played and broadcast all over the world; her music is published by Novello and by Peters Edition Ltd. She has been commissioned by the BBC, by festivals in UK and beyond, and by leading orchestras, ensembles and soloists. Many works are available on CD, including music for strings (Naxos), Horn Concerto (NMC) and Saxophone Concerto (NEOS).
She has a particular affinity for vocal music and has composed eight operas: Dawnpath (New Opera Company, London, 1977), The Story of Mary O’Neill, a radio opera, libretto Sally McInerney, (BBC, 1987), The Green Children, a children’s opera, libretto Kevin Crossley-Holland, (Kings Lynn Festival, 1990), Blood Wedding, libretto Deborah Levy (WPT, London 1992), The Wildman, libretto Crossley-Holland, (Aldeburgh Festival, 1995), Light Passing, libretto John Edmonds, (BBC/NCEM, York, 2004), Dream Hunter, libretto John Fuller (Lontano, Wales 2011, London 2012) and Tokaido Road, a Journey after Hiroshige, libretto Nancy Gaffield, (Okeanos, Cheltenham Festival, July 2014.)
She is active in many aspects of the musical profession, as composer, teacher, director and as a member of various public boards and new music organisations. From 1994–2008 she was Professor of Music at the University of York, where many gifted composers came to study with her. Previously she taught composition at Kings' College London; in the 1970s, she directed Morley College Music Theatre.
In 2015 she was awarded the Elgar bursary, which carries a commission from the Royal Philharmonic Society. In 2017 she was BBC Radio 3 ‘Composer of the Week’.
Recent premieres include works for chamber ensemble, with or without voice, for solo instrumentalists, and for orchestra. Threnody was premiered in Dublin in 2015 (RTE NSO) and The Crimson Bird, the RPS commission, at the Barbican, London, in 2017. BBCSO/Ilan Volkov with Rachel Nicholls, soprano soloist.