 Another central institution, Leith Nautical College, Edinburgh, closed in 1987 by merger into the further education sector.Academic degrees in central institutions were validated by the Council for National Academic Awards (CNAA) until 1992.Like the designation "polytechnic", the term "central institution" is currently rarely used since most of these institutions entered the university sector in 1992 when the Further and Higher Education Act 1992 came into effect.