After
Oxford, Llewellyn was engaged as an aide to
Governor Chris Patten in
Hong Kong from 1992 to 1997, as a member of Patten's '
Cabinet' following Patten's appointment as a
European Commissioner from 1999 to 2002, and then as Chief of Staff to former
Liberal Democrat Leader Paddy Ashdown in his role as
High Representative for Bosnia and Herzegovina from 2002 to 2005. Appointed a
Member of the Order of the British Empire (MBE) in the
1997 Birthday Honours, Llewellyn was promoted to
Officer of the same Order (OBE) in the
2006 New Year Honours. In July 2021, Lord Llewellyn was appointed an
Honorary Captain in the
Royal Naval Reserve.
Chief of Staff to David Cameron Following
David Cameron's victory at the
Conservative leadership election in December 2005, Llewellyn was hired to be Cameron's personal chief of staff in his capacity as
Leader of HM Opposition, continuing in this role until 2010.
Coalition negotiations He served as part of the Conservative Party's negotiating team, along with
George Osborne,
William Hague and
Oliver Letwin, when negotiating a prospective deal with the
Liberal Democrats after the
2010 general election. Their negotiations being successful, the
Conservative–LibDem coalition agreement was drawn up leading to the formation of
the coalition government in 2010.
Downing Street Chief of Staff Cameron became
Prime Minister and appointed Llewellyn to the post of
Downing Street Chief of Staff. In July 2011, several newspapers reported that Llewellyn asked Metropolitan Police Assistant Commissioner
John Yates not to speak to Cameron about the
News International phone hacking scandal. On 14 May 2015 following the
Conservatives' general election victory, Llewellyn was sworn of the
Privy Council.
House of Lords In August 2016, Llewellyn was nominated for elevation as a
life peer in
David Cameron's
Resignation Honours, being created on 20 October 2016 as
Baron Llewellyn of Steep, of Steep, in the County of Hampshire.
Introduced by
Lord Patten of Barnes and
Lord Hague of Richmond on 31 October, Lord Llewellyn took his seat on the
Conservative benches in the
House of Lords. ==Diplomatic career==