The letter was signed by Sara Long, chief executive of the Education Authority, Roisin Marshall, chief executive of the Council for Integrated Education, Gerry Campbell, chief executive of CCEA, Nuala O’Neill, chief executive of the Governing Bodies Association NI, Eve Bremner, chief executive of the Council for Catholic Maintained Schools, Mark Baker, chief executive of the Controlled Schools’ Support Council and Maria Thomasson, chief executive of Comhairle na Gaelscolaiochta.