Career
Horgan has appeared in several British television productions including Peep Show, Lewis, The Rotter’s Club, Midsomer Murders and Jane Eyre. She has appeared in the Miramax film The Boy in the Striped Pyjamas and The Wedding Video. She has appeared in music video’s for Years and Years single ‘Desire’ and Chemical Brother’s sonar ‘I’ll See You There’ In 2008, Horgan appeared in Hedda, a modern updated version of Hedda Gabler, directed by Carrie Cracknell in which she played the lead character to favourable reviews.
Reviewer Charles Spencer in The Telegraph wrote that she was "especially fine as a glamorous, bob-haired Hedda.. using sexual. like a shrimping Netto." In 2009 she appeared in a revival of Ferdinand Bruckner"s Krankheit der Jugend ("Pains of Youth"), directed by Katie Mitchell, at the National Theatre.
In 2010, she appeared in Caryl Churchill"s Far Away, directed by Simon Godwin. In 2011, she performed in The School for Scandal directed by Deborah Warner and written by Richard Brinsley Sheridan.
From 2013-2015 she joined Sean Holmes ten-member Secret Theatre company at the Lyric Hammersmith, which experimented with improvisational techniques towards drama. She performed with the ensemble for two years to positive reviews.
In an extended interview in Exeunt Magazine, she described her work at Secret Theatre as giving her "freedom to play".
In 2015, she appeared in The Mother at the Ustinov Studio in Bath.