MI5 T Branch

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'T Branch of MI5 was created in 1990 with responsibility for Irish counter-terrorism.[1] It is also responsible for other forms of domestic terrorism.[2]

Organisation

Directors

Sections

T1

Prepared the case for the transfer of responsibility for republican terrorism from Metropolitan Police Special Branch in 1991.[5]

T2

Responsible for Irish Terrorism in Great Britain.[6]

  • Eliza Manningham-Buller - First head of T2[7] 1992-93[8]
  • T2A: Republican and loyalist terrorism in Great Britain.
  • David Shayler, T2 officer.[9]
  • T2B: Liaison with local Special Branches and agent runners responsible for investigating Irish terrorism in Great Britain.
  • T2C: Threat assessment for Irish terrorist groups.
  • T2D: Researches Irish terrorist groups.
  • T2E: Liaises with Metropolitan Police Special Branch, based at Scotland Yard.[10]

T5

  • T5/0 Stephen Lander, c. 1991.[11]
  • T5B: Investigates arms trafficking
  • T5C: Counters Irish terrorism in Continental Europe, including the Republic of Ireland.
  • T5D: Irish terrorism in the rest of the world.
  • T5E: Studies terrorist logistics

T8

  • T8: T Branch agent-runners, includes a Northern Ireland-based section.[12]

Other T Branch officers

Agents

Notes

  1. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.772.
  2. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, pp.863-864.
  3. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.775.
  4. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.786.
  5. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.773.
  6. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.776.
  7. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.776.
  8. Mark Hollingsworth and Nick Fielding, Defending the Realm: Inside MI5 and the War on Terrorism, André Deutsch, 1993, p.290.
  9. Mark Hollingsworth and Nick Fielding, Defending the Realm: Inside MI5 and the War on Terrorism, André Deutsch, 1993, p.145.
  10. Mark Hollingsworth and Nick Fielding, Defending the Realm: Inside MI5 and The War on Terrorism, André Deutsch, 2003, pp.320-321.
  11. Christopher Andrew, Defence of the Realm, The Authorized History of MI5, Allen Lane, 2009, p.772.
  12. Mark Hollingsworth and Nick Fielding, Defending the Realm: Inside MI5 and The War on Terrorism, André Deutsch, 2003, pp.320-321.
  13. Stuart Jeffries, The spy who loved me, The Guardian, 15 November 2002.
  14. Mark Hollingsworth, Second MI5 officer attacks security service, The Guardian, 22 July 2000.
  15. Mark Hollingsworth and Nick Fielding, Defending the Realm: Inside MI5 and the War on Terrorism, André Deutsch, 1993, p.145.