 She is also a fellow of the Royal College of Surgeons in Ireland.Professor Barrett was an undergraduate at St Bartholomew's Hospital in London and did her postgraduate training at University College Hospital, the Middlesex Hospital, and the Westminster Hospital.Following that she spent a year in Paris at the Fondation Curie and l’Institut Gustav Roussy before returning to the Royal Marsden Hospital for ten years, first as lecturer, and then senior lecturer and consultant with a particular interest in paediatric oncology and cancer in young people.