Caoilfhionn regularly acts for media organisations, journalists and NGOs in cases concerning free speech, reporting and newsgathering. Her media law practice focuses mainly upon reporting restrictions, anonymity and open justice matters, although she also regularly advises on other issues including journalistic access to information, defamation, privacy and production orders. She regularly advises the BBC on pre-publication legal matters. She has a particular niche in relation to open justice issues in the inquest context: she regularly acts for media organisations and journalists in the Coroners’ Courts, and she advises the Media Lawyers’ Association on media law issues in relation to inquests. She currently acts for a number of media organisations resisting private hearings in police misconduct cases. She has acted for the media in the majority of recent Reporting Restriction Order (RRO) cases in the Family Division, including the Poppi Worthington case (she was in December 2015 named Times 'Lawyer of the Week' for her work on this case).
Caoilfhionn also has expertise in freedom of expression under the European Convention on Human Rights and international instruments. She has delivered training on Articles 10 and 11 ECHR to Turkish judges on behalf of the Council of Europe, and she is a former trustee of Global Dialogue where she worked on issues concerning free speech, freedom of association and the right to protest in Turkey. She regularly acts for interveners in the European Court of Human Rights on freedom of expression issues. She is experienced in the use of the UN’s special procedures of the Human Rights Council to raise concerns for detained journalists and peaceful protestors: for example, she currently leads the international legal team for Ibrahim Halawa, an Irish man detained in Egypt, arrested aged 17 when attending a peaceful protest.