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The 'Office of Population Censuses and Surveys' (OPCS), was created in May 1970 through the merger of the General Register Office and the Government Social Survey Department.
It was a forerunner and constituent, with the UK Central Statistical Office, of the Office for National Statistics, in which they combined in 1996 under a single director who, from 2000 was also known as the National Statistician. The director of OPCS was also Registrar-General for England and Wales.