January 18, 2026
Council of Civil Service Unions v Minister for the Civil Service [1984] UKHL 9
Civil servants at GCHQ were banned from joining national trade unions without prior consultation, citing national security. The unions claimed legitimate expectation of consultation. The House of Lords held that while prerogative powers are subject to judicial review, national security concerns justified the government's failure to consult. Facts Government Communications Headquarters (GCHQ) was a branch of the civil service handling sensitive intelligence and communications vital to national security. Since 1947, staff had been permitted to belong to national trade unions, with established consultation practices through departmental Whitley Councils. Between 1979 and 1981, industrial action at GCHQ caused significant disruption to
