| Witnesses | Role |
| The Hon Dominic Asquith CMG |
Director Iraq, 2004 to 2006
HM Ambassador to Iraq, 2006 to 2007 |
| Major General Graham Binns CBE DSO MC |
General Office Commanding Multi National Division (South East), 2007 to 2008 |
| Major General Adrian Bradshaw CB OBE |
Commander 7th Brigade 2003 |
| Edward Chaplin CMG OBE |
HM Ambassador to Iraq, 2004 to 2005 |
| Sir Richard Dearlove KCMG OBE |
Chief SIS, 2001 to 2004 |
| Tim Dowse CMG |
Chief of Assessments Staff, 2003 to 2009 |
| Sir William Ehrman KCMG |
Chairman, Joint Intelligence Committee, 2004 to 2005 |
| Sir Jeremy Greenstock GCMG |
HM Ambassador to the United Nations, 1998 to July 2003
UK Special Representative for Iraq, 2003 to 2004 |
| Martin Howard CB |
Deputy Chief of Defence Intelligence, 2003 to 2004
Director General Operational Policy, 2004 to 2007 |
| Lieutenant General Sir Graeme Lamb KBE CBE DSO |
General Officer Commanding Multi National Division (South East), 2003 to 2003
Senior British Military Representative – Iraq, 2006 to 2007 |
| Major General Michael Laurie CBE |
Director General Intelligence Collection, 2002 to 2003 |
| Ian Lee |
Director General Operational Policy, Ministry of Defence, 2002 to 2004 |
| Sir David Manning GCMG CVO |
Foreign Policy Adviser to the Prime Minister, 2001 to 2003
HM Ambassador to Washington 2003 to 2007 |
| Julian Miller CB |
Chief of Assessments Staff, 2001 to 2003 |
| Christopher Prentice CMG |
HM Ambassador to Iraq, 2007 to 2009 |
| Sir John Scarlett KCMG OBE |
Chairman, Joint Intelligence Committee, 2003 to 2004
Chief of SIS, 2004 to 2009 |
| Major Gen Jonathan Shaw CBE |
General Officer Commanding Multi National Division (South East) 2007 |
| Sir Kevin Tebbit KCB CMG |
Permanent Under Secretary of State, Ministry of Defence, 1998 - 2005 |
| Major General Tim Tyler CB |
Deputy Commander Iraq Survey Group, 2004 |
| Simon Webb CBE |
Policy Director, Ministry of Defence, 2001 to 2004 |