Una trained at Bull Alley and The Actors Workshop. Previous work includes Fear and Misery of The Third Reich, The Mother and Snakeskin, all with Pale Mother Theatre Co., T.I.E. (Theatre in Education) with Minds at Work and Beg Borrow and Steal Theatre Co., Woyzeck with Loose Canon Theatre Co., Anna Karenina with Theatreworks Theatre Co.

Una's short films include A Day in the Life of Morris for Open Channel, Two and Blatant Disregard for DLCAD, and Lunchbox for DIT.