E/C.12/GBR/CO/6 Higher education 65. While noting that various systems to support access to higher education are in place in the State party, the Committee is concerned that university fees are increasing, which affects equal access to higher education (art. 13). 66. The Committee recommends that the State party take all necessary steps to reduce higher education fees, with a view to making higher education equally accessible to all, in accordance with capacity, and by progressively introducing free higher education. Irish language 67. The Committee remains concerned about the lack of effective measures adopted by the State party to promote the use of the Irish language in Northern Ireland (art. 15). 68. The Committee reiterates its previous recommendation (see E/C.12/GBR/CO/5, para. 37) and recommends that the State party adopt an Irish language act. D. Other recommendations 69. The Committee encourages the State party to ratify the Optional Protocol to the International Covenant on Economic, Social and Cultural Rights. 70. The Committee encourages the State party to consider ratifying the core human rights instruments to which it is not yet party, namely the International Convention on the Protection of the Rights of All Migrant Workers and Members of Their Families, the International Convention for the Protection of All Persons from Enforced Disappearance, the Optional Protocol to the International Covenant on Civil and Political Rights and the Optional Protocol to the Convention on the Rights of the Child on a communications procedure. 71. The Committee recommends that the State party take steps to progressively develop and apply appropriate indicators on the implementation of economic, social and cultural rights in order to facilitate the assessment of progress achieved by the State party in complying with its obligations under the Covenant for various segments of the population. In this context, the Committee refers the State party to, inter alia, the conceptual and methodological framework on human rights indicators developed by the Office of the United Nations High Commissioner for Human Rights (see HRI/MC/2008/3). 72. The Committee requests the State party to disseminate the present concluding observations widely among all levels of society, at national, provincial and territorial levels, particularly among parliamentarians, public officials and judicial authorities, and to inform the Committee, in its next periodic report, about the steps taken to implement the recommendations contained herein. The Committee also encourages the State party to engage non-governmental organizations and other members of civil society in the follow-up to the present concluding observations and in the process of consultation at the national level prior to the submission of its next periodic report. Furthermore, the Committee requests the State party to ensure effective coordination with all devolved administrations, particularly Northern Ireland, and with its Overseas Territories and Crown Dependencies at all stages of the implementation of the recommendations contained in the present concluding observations and in the preparation of its next periodic report. 12