Diana specialises in devolution and territorial politics in the UK, with an emphasis on Welsh and English devolution. More broadly, Diana's work focuses on contemporary issues in parliamentary democracy, such as public engagement, gender representation, as well as on policy and administrative reform in the UK and in transitional countries. She often undertakes advisory and consultancy work in relation to the National Assembly for Wales, provides expert advice on constitutional and legislative matters, and delivers bespoke executive training for overseas civil servants. Diana is also an Independent Trustee for the Centre for Public Scrutiny and promotes the importance of scrutiny and accountability in the governance process.