Civil Servants (Grades) Mr. John Garrett asked the Minister for the Civil Service how many general Treasury classes and how many departmental classes of civil servants there are currently. Mr. Charles R. Morris There are at present about 500 departmental classes and 36 general service classes, together containing some 27 per cent. of the total staff in post of the non-industrial Civil Service. The remaining 73 per cent. have been restructured into 19 occupational groups in 10 categories, with a fully unified open structure at under-secretary level and above.