Before revision: The Government Communications Headquarters (GCHQ) operates "Tempora" Tempora is the codeword for a formerly secret computer system that is used by the British Government Communications Headquarters (GCHQ).
After revision: The Government Communications Headquarters (GCHQ) operates "Tempora" Tempora is the codeword for a formerly-secret computer system that is used by the British Government Communications Headquarters (GCHQ).