The trial before Mr Justice Thesiger, which was already controversial, achieved greater notoriety when the Government attempted to introduce testimony from three anonymous SIGINT officers, who were successively referred to as Colonel A, Colonel B, and Mr. C.
Timeline
18 February1977: Aubrey and Campbell interviewed Berry. They were arrested and charged under section 2 of the Official Secrets Act.
24 May1977: Further charges were added under section 1 of the Official Secrets Act.
9 August1977: Additional charge under section 1 against Duncan Campbell, for collecting information