Sedwill joined the Foreign and Commonwealth Office (FCO) in 1989 and he served in the Security Coordination Department and the Gulf War Emergency Unit until 1991.
He then served as the Deputy High Commissioner to Pakistan, based in Islamabad from 2003 to 2005, then the Deputy Director for the Middle East and North Africa Department of the Foreign Office. From 2006 to 2008, he served as International Director of the UK Border Agency, part of the Home Office.[3][6]
In May 2011, Sedwill took over as the FCO's Director-General for Afghanistan and Pakistan (and thus as the UK's Special Representative for Afghanistan and Pakistan) from Karen Pierce. He additionally became the FCO's Director-General, Political, in autumn 2012, replacing Geoffrey Adams.
Sedwill said of his life before government "I've had a gun in my face from Saddam Hussein's bodyguards. A bomb under my seat at a polo match in the foothills of the Himalayas; I've been hosted by a man plotting to have me assassinated; I've been shot at, mortared and even had someone come after me with a suicide vest."[9]
During his time as Permanent Secretary, one of the organisations the Home Office is responsible for,[12]MI5, failed to adequately safeguard data. In 2019 Lord Justice Sir Adrian Fulford stated MI5 had a "historical lack of compliance" with sections of the Investigatory Powers Act in 2016.[13]
Cabinet Secretary
Sedwill (left) meets with US Secretary of State Mike Pompeo in March 2019.
Sedwill became acting Cabinet Secretary in June 2018, while Jeremy Heywood took a leave of absence on medical grounds, and was appointed to replace Heywood on his retirement on 24 October 2018.[14] He is the second Cabinet Secretary never to have worked at HM Treasury, and the first whose career has been dominated by diplomatic and security work.[4][15] He was described as the Prime Minister's "first and only choice" to replace Heywood, with no recruitment process taking place and some suggesting the urgency of arrangements for the UK's departure from the European Union as a reason for the quick appointment.[4][15][16] Prime Minister Theresa May was criticised for allowing Sedwill to remain as National Security Adviser alongside his role as Cabinet Secretary, with speculation that the role was being kept for Europe adviser Oliver Robbins.[15][17][18]
In a February 2019 interview Sedwill said he would retain his role as National Security Adviser to the Prime Minister since becoming Cabinet Secretary is part of moves to make a success of Brexit. In an interview with Civil Service Quarterly, Sedwill said retaining the post would also ensure a "genuine sense of teamwork across and beyond government".[19]
In April 2019 it was reported that Sedwill had written to ministers on the National Security Council and their special advisers after The Daily Telegraph reported details of a meeting about Chinese telecoms company Huawei. Following the meeting of the council, the Telegraph reported that it had agreed to allow Huawei limited access to help build Britain's new 5G network, amid warnings about possible risks to national security. Several cabinet ministers have denied they were involved.[20]
In July 2019, The Times reported that two unnamed senior civil servants had said the 70-year-old Jeremy Corbyn might have to stand down due to health issues. The article drew an angry response from Labour, which denounced the comments as a "scurrilous" attempt to undermine the party's efforts to gain power. Downing Street said that Sedwill would write to Corbyn after the party demanded an inquiry into alleged comments. Corbyn said the civil service has a duty to be non-political.[21]
In November 2019, Sedwill blocked the publication of a document written by civil servants to cost the Labour Party's fiscal plans before a general election. Shadow ChancellorJohn McDonnell had complained to Treasury Permanent Secretary Tom Scholar in a meeting arguing it would interfere in the upcoming general election.[22]
In June 2020, it was announced that Sedwill would be stepping down from his civil service appointments in September 2020.[23]The Telegraph said that Downing Street regarded Sedwill as "too much of a Europhile and establishment figure" to be in post through planned Whitehall reforms.[24]
Sedwill stepped down as national security adviser in September 2020. He was to be replaced by David Frost, who was Johnson's special adviser and chief negotiator in talks on the post-Brexit trade and security relationship with the EU. This would be a political appointment, while all previous national security advisers had been civil servants.[25] However, an FOI answer stated that Frost continued as Chief Negotiator to the EU as of October 2020, and David Quarrey took over the role of acting NSA.[26]
Sedwill was appointed a Non-Executive Director of BAE Systems PLC on 1st November 2022. He is also a senior adviser and Supervisory Board member of Rothschild & Co, the Senior Independent Director and Senior Deputy Chair of Lloyd’s of London, and the Chairman of the Atlantic Future Forum.[28]
Speaking to the Covid Inquiry, Simon Case and Sedwill described Boris Johnson’s Downing Street as “poisonous”, “mad” and unfit to run the country. Giving evidence, “I’ve never seen a bunch of people less well-equipped to run a country,” Simon Case, then head official in the Cabinet Office, wrote in July 2020 to Mark Sedwill.[29]
^ abcdef"Sedwill, Mark Philip, (born 21 Oct. 1964), Permanent Secretary, Home Office, since 2013", Who's Who, Who's Who, A & C Black, 1 December 2021, doi:10.1093/ww/9780199540884.013.u45087
^"Deputy National Security Advisers"(PDF). whatdotheyknow.com. Whatdotheyknow. 23 October 2020. Retrieved 23 October 2020. David Frost remains Chief Negotiator for the EU talks and those negotiations will remain his top single priority until they have concluded, one way or another. Therefore, the Prime Minister agreed that David Quarrey should become Acting NSA
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