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PDF 82 Mar 25 Th Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signals (?1902Z) ("Argentine naval exchanges and sitrep relating to British ship in Falklands and South Georgia area") [24-25 March signals] [declassified May 2023]
PDF 82 Mar 30 Tu Declassified documents Key Archive (TNA) Falklands: GCHQ intercept of Argentine signal ("Argentine submarine force commander gives instructions relating to possible submarine threat, and also to reconnaissance mission") ["reconnaissance of the beach and/or disembarkation [word garbled]"] [declassified May 2023]
PDF 82 Apr 14 We Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal (1104Z) ("Argentine navy issues summary reporting military and political situation claim to have detected British submarines by radar") [Commander of Maritime Fleet signal to 25 de Mayo - pressures on MT increasing; "Russia might intervene"] [declassified May 2023]
PDF 82 Apr 18 Su Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal (1126Z) ("Argentine naval activity: Commander, submarine forces gives details of Task Force 79 and issues combat instructions") [no Super Etendards embarked on 25 de Mayo; all submerged submarines to be treated as hostile] [declassified May 2023]
PDF 82 Apr 22 Th Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal ("Argentine summary of intelligence on British forces, 21 April: advance action against Georgias not ruled out") [British Task Force could arrive in operational area from 27/28 April] [declassified May 2023]
PDF 82 Apr 23 Fr Declassified documents Minor Archive (TNA) Falklands: GCHQ intercept of Argentine signal (2126Z) ("Argentine naval/air activity: destroyer Trinidad reports results of naval/air exercise") ["extremely effective"] [declassified May 2023]
PDF 82 Apr 24 Sa Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal (0636Z) ("Argentine battle plan: details from Commander Task Force 79") ["wait and see posture"; "aiming to make it difficult for the opponent to act by dividing his efforts by means of a threat from different directions"] [declassified May 2023]
PDF 82 Apr 26 Mo Declassified documents Minor Archive (TNA) Falklands: GCHQ intercept of Argentine signal (0533Z) ("Argentine air force commander claims morale is high, after to visit to Falklands on 24 April") [Lami Dozo visit] [declassified May 2023]
PDF 82 Apr 26 Mo Declassified documents Minor Archive (TNA) Falklands: GCHQ intercept of Argentine signal (2132Z) ("Tanker Medanos ordered to return to port - 25 April") ["return to Puerto Belgrano immediately"] [declassified May 2023]
PDF 82 Apr 30 Fr Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal (1442Z) ("Commander Task Force states that Argentine submarines have entered exclusion zone; air and surface units of Task Force 79 are authorised to operate in zone if necessary") [declassified May 2023]
PDF 82 May 9 Su Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal (2220Z) ("Falkland Islands dispute: Commander South Atlantic Area evaluates British capabilities for anticipated hostilities") [as assigned by the Military Committee] [declassified May 2023]
PDF 82 May 13 Th Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal (2033Z) ("Air Authority Comodora Rivadavia requests assessment of probability of British air attack against mainland") [possible Vulcan attack on military airbases] [declassified May 2023]
PDF 82 May 30 Su Declassified documents Key Archive (TNA) Falklands: GCHQ intercept of Argentine signal (0531Z) ("Falkland Islands Dispute: Commander Falklands Group laments the inferiority of Argentine forces") [battle for Darwin/Goose Green assessed; British possess absolute air superiority and control of the sea, "unsurpassable conditions to extend the occupation of the islands"] [declassified May 2023]
PDF 82 Jun 4 Fr Declassified documents Minor Archive (TNA) Falklands: GCHQ intercept of Argentine conversations (0210Z) ("Further military activity in Falklands 1 June") [conversation fragments overheard on an Argentine military net] [declassified May 2023]
PDF 82 Jun 7 Mo Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal (0516Z) ("Falkland Islands Dispute: Commander Naval Operations provides update on British situation at 061422 June 1982") [position of British carrier 115-150 miles east of Port Stanley] [declassified May 2023]
PDF 82 Jun 13 Su Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine conversation (2234Z) ("Argentine air force entity Falklands gives brief summary of situation around midday 13 June") [impact of British artillery: "their fire power has complete dominance over ours"] [declassified May 2023]
PDF 82 Jun 13 Su Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signal (2049Z) ("Argentine Naval Commander Falklands submits plan, 13 June, for naval and air operations against British forces") [attack by 'subtle' forces on San Carlos logistics set-up] [declassified May 2023]
PDF 82 Jun 14 Mo Declassified documents Major Archive (TNA) Falklands: GCHQ intercept of Argentine signals (2156Z) ("Argentine air force conversations from Falklands on 13 June indicate limit of Argentine resistence [sic] estimated at only 24 to 48 hours") [high level commander told that "'final decision' was probably to be taken soon"] [declassified May 2023]
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Documents lie at the core of this website, each one dated and sorted chronologically (by default) in search results. Most are images in PDF format of original paper documents scanned or filmed for the site. There also transcripts of speeches and interviews, press articles, photos, videos, and more. The document database contains tens of thousands of items and permits complex searching.

Files are multi-page PDFs from which most of the documents on the site are selected. All of Mrs Thatcher’s official files from No.10 are available in full on this site (paper copies are stored at the National Archives in the series PREM19), as well as most of those of Geoffrey Howe and Nigel Lawson as Chancellor (stored at TNA as series T639 and T640).

Guides are articles about key events and topics. Many were written to accompany annual releases of Mrs Thatcher’s private and party papers at the Churchill Archive Centre in Cambridge.

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