On 8 July 2002, O'Donnell took over from
Sir Andrew Turnbull as Permanent Secretary of
the Treasury following the appointment of Sir Andrew as
Cabinet Secretary. On 15 June 2005, it was announced that O'Donnell would again replace Turnbull, this time as Cabinet Secretary, on the latter's imminent retirement. O'Donnell is known for his "wondrous interpersonal gifts" and his informal style. He regularly visited Civil Service departments outside London "to meet civil servants at work". During his time as Cabinet Secretary, his authority was seen as absolute, giving rise to the affectionate nickname "GOD" based on his initials as they appeared in Government papers. The annual remuneration for this position was £235,000. In his role as Cabinet Secretary, O'Donnell was responsible for overseeing the review of
Christopher Meyer's controversial memoirs,
DC Confidential, in November 2005. The previous month, he had told the
Public Administration Select Committee that it was "wrong" for civil servants to publish personal memoirs. On 10 August 2010,
Channel 4 News reported that O'Donnell would leave his post before the end of the current Parliament. In January 2011, it emerged that O'Donnell had decided not to publish correspondence sent between
Tony Blair and
George W. Bush prior to the 2003 invasion. The papers were, however, provided to the
Iraq Inquiry itself. His reasoning is explained in several documents between him and
Sir John Chilcot. In November 2010, O'Donnell published a draft copy of the
Cabinet manual. This document outlines the laws, rules and conventions that apply to the British executive. On 11 October 2011, it was announced by Downing Street that O'Donnell was to retire at the end of the year. His successor was announced as the
Downing Street Permanent Secretary Jeremy Heywood. However, the roles of Cabinet Secretary, Head of the Civil Service and Permanent Secretary at the Cabinet Office were split. On 22 December 2011, O'Donnell said that the future of the
Union is one of several "enormous challenges" facing the political establishment in the coming years. "Over the next few years there will be enormous challenges, such as whether to keep our kingdom united," he warned officials and politicians. ==Post-Cabinet Secretary==