Britt was a chartered physiotherapist with the Royal Ballet Company for 20 years before retraining to become a Chartered Psychologist. She is an accredited European Psychologist and Cognitive Behavioural Psychotherapist. She is an Honorary Fellow at Goldsmith Colledge of the University of London due to her contributions to Performance Psychology. She has been the psychologist to the Royal Ballet Company for 20 years. She has also been the psychologist to the Central School of Ballet and English National School of Ballet for 14 years. She has been the Performance Psychologist to the British Olympic Association for 12 years and the Norwegian Olympic Association for 14 years.