In the early 1950s Holst became Benjamin Britten's musical assistant, moved to Aldeburgh, and began helping with the organisation of the annual Aldeburgh Festival. In 1956 she became joint artistic director of the festival, and during the following 20 years helped it to a position of pre-eminence in British musical life. In 1964 she gave up her work as Britten's assistant to resume her own compositional career and to concentrate on the preservation of her father's musical legacy. Her own music is not widely known and has received little critical attention; much of it is unpublished and unperformed. The first recordings dedicated to her works, issued in 2009 and 2012, were warmly received by critics. She was appointed CBE in 1975 and received numerous academic honours. She died at Aldeburgh and is buried in the churchyard there.
