Theatre has been as prevalent in Flora's career as film and television. She won the Irish Times Best Actress Award for her role as the lead in Strindberg's Miss Julie. Other 'classic' roles include Yelena in Chekov's Uncle Vanya, Ophelia in Hamlet and Katherina in Taming of The Shrew. She has worked with many contemporary playwrights such as Neil LaBute who directed her in his monologue "Bash".

Flora performed in the world premier of "The Reckoning" a two-hander with Jonathan Pryce, and also in the award winning Dinner, both in the West End. She has also recorded numerous radio plays, most recently the Oscar winner Frederic Raphael's Glittering Prizes. Flora grew up by the shores of Strangford Lough in Northern Ireland. Flora was educated in Belfast and London, and trained in Dublin.