Holt's early contributions include minor roles as orchestrator and copyist on films such as
Stardust. After graduating, she composed her own music for a number of short films, including the
Royal Television Society award-winning short
Friends Forever (2008), while working as a professional violinist. In 2007, she became part of
RaVen Quartet, a London-based
string quartet that performed their own musical arrangements. RaVen would go on to perform with
Madness during the
2012 London Olympics closing ceremony. By this time, the group had also played for
Prince Harry at
Buckingham Palace and were part of
George Michael's Symphonica tour. Holt's breakthrough in
composing came in 2012, when she worked with
Martin Phipps on
Great Expectations, which was nominated for a
BAFTA award for Best Score. Holt then co-composed with Phipps for the BBC drama
The Honourable Woman, for which they jointly won the 2015
Ivor Novello Award for Best Television Soundtrack, and were nominated again for a BAFTA. She most recently collaborated with Phipps in 2017 for
Victoria, for which she was nominated for a
Primetime Emmy Award in the category of "Outstanding Music Composition for a Series". Holt subsequently wrote the original scores for a number of other high-profile television dramas including the multiple BAFTA award-winning and
Royal Television Society winning score for Philippa Lowthorpe's drama series
Three Girls. Holt has also worked on
My Mother and Other Strangers, the final series of
Wallander, and the BBC adaptation of Sathnam Sanghera's novel
The Boy With The Topknot. In addition, she has scored two BBC TV series written by BAFTA award-winning playwright Mike Bartlett (
Press and
Sticks and Stones), Gurinder Chada's 2018 series
Beecham House, and in 2020 was nominated for a
Royal Television Society Award for her score to ITV drama
Deadwater Fell. Holt has also composed music for a number of films including Saul Dibb's film adaptation ''
Journey's End'', for which she jointly won Best Score at Beijing International Film Festival with
Hildur Guðnadóttir. Peter Bradshaw named the score in his BAFTA predictions of 2018, and the score was described as "sinuously driving the narrative momentum" and "creating a sense of horror and dread". Holt wrote additional music for Heyday Film's
Paddington and the score for the first feature from Deborah Haywood,
Pin Cushion, which premiered at the
Venice Film Festival in 2018. In 2019, she worked on
Infidel and
Herself. She has most recently worked on the
Marvel Studios Disney+ series
Loki, which is set in the
Marvel Cinematic Universe and was described in the Washington Post as delivering "a suspenseful and mysterious vibe while providing Marvel's horned menace with a theme song that might just be the MCU's best". In 2022, it was announced that Holt would serve as composer for the
Obi-Wan Kenobi series for
Disney+, becoming the first woman to ever score a live-action
Star Wars project. In 2022, Holt had worked on composing the score for
Batgirl, a film that was ultimately canceled during production. In the 2013 final of ''
Britain's Got Talent'', Holt was performing in the backing orchestra of finalists
Richard & Adam. During their performance she walked on stage and threw eggs at the judge,
Simon Cowell. She was protesting Cowell's "dreadful influence on the music business". == Personal life ==