Correspondence and papers on the prosecution of the Ministry of Defence official Clive Ponting under the Official Secrets Act after he sent documents on the sinking of the Argentine warship General Belgrano during the Falklands War to the MP Tam Dalyell. Includes: script of Twenty Twenty Vision programme "MI5’s Official Secrets"; press cuttings; chronology of events; texts of interviews; letters from Tam Dalyell (3); issues of the New Statesman.