Question: Which region did this son of Marion Kozak and British politician who was Leader of the Labour Party and Leader of the Opposition in the 2010s, represent as Member of Parliament in 2005?

Context paragraphs:
Labour Party (UK) Shadow Cabinet election, 1993: Elections to the Labour Party's Shadow Cabinet took place in October 1993, at the beginning of the 1993/4 session of parliament.  Under the rules then in effect, the Commons members of the Parliamentary Labour Party elected 18 members of the Official Opposition Shadow Cabinet, who were then assigned portfolios by the leader.  The Commons members of the PLP separately elected the Chief Whip, and the Labour peers elected the Leader of the Opposition in the House of Lords.  In addition, the Leader of the Labour Party and Deputy Leader (John Smith and Margaret Beckett, respectively) were members by virtue of those offices.  The 18 elected members of the Shadow Cabinet were the ones with the largest number of votes.  Beginning with this election, MPs were required to vote for at least four women, but women were no longer guaranteed three places in the Shadow Cabinet.

Marion Kozak: Marion Kozak or Marion Kozak Miliband (born 1934 as Dobra Jenta Kozak, also known as Maria Kozak) is a Polish-born British activist.  She emigrated to the United Kingdom in the 1950s.  In 1961 she married Ralph Miliband (1924–1994) and their two sons, David Miliband and Ed Miliband, have risen to prominence in modern-day British politics.

Ad Melkert: Adrianus Petrus Wilhelmus "Ad" Melkert (] ; born 12 February 1956) is a Dutch politician and diplomat of the Labour Party (PvdA).  He served as a Member of the House of Representatives from 3 June 1986 until 22 August 1994 when he became Minister of Social Affairs and Employment in the Cabinet Kok I following the Dutch general election of 1994.  At the end of the parliamentary period, he was not included in the Cabinet Kok II after the Dutch general election of 1998 by his own request, as he wanted to focus his energies on his candidacy to succeed Wim Kok as the next Party leader of the Labour Party.  Melkert returned to the Member of the House of Representatives on 13 July 1998 and became the Parliamentary leader of the Labour Party in the House of Representatives on 13 July 1998 and became the presumed de facto next Party leader of the Labour Party in all but name.  He was elected the official Party leader of the Labour Party on 15 December 2001 and became the lijsttrekker (top candidate) for the Dutch general election of 2002.

Chris Carter (politician): Christopher Joseph Carter (born 4 May 1952) is a former independent Member of Parliament in New Zealand, and a former member of the New Zealand Labour Party until his expulsion.  Carter was a senior Cabinet Minister in the Fifth Labour Government of New Zealand, serving lastly as Minister of Education, Minister Responsible for the Education Review Office and Minister of Ethnic Affairs.  He was the Member of Parliament for the Te Atatu electorate, where he was first elected in 1993.  He did not win re-election (to Waipareira) in 1996, but won a new and expanded Te Atatu seat in 1999.  In 2010 he was suspended from the Labour Party caucus following a dispute with party leader Phil Goff, shortly afterwards he became an independent MP.  He was expelled by the Labour Party for breaching the Party's constitution in bringing the Party in disrepute, on 11 October 2010.  In September 2011 Carter resigned from Parliament following his appointment to a United Nations position in Afghanistan.

Tony Blair: Anthony Charles Lynton Blair (born 6 May 1953) is a British politician who served as Prime Minister of the United Kingdom from 2 May 1997 to 27 June 2007 and Leader of the Labour Party from 21 July 1994 to 24 June 2007.  He previously served as Leader of the Opposition from 21 July 1994 to 2 May 1997.  He is the most recent British Labour Party leader to have won a general election.

Harriet Harman: Harriet Ruth Harman, {'1': ", '2': ", '3': ", '4': "} (born 30 July 1950) is a British solicitor and Labour Party politician who has been a Member of Parliament (MP) since 1982, first for Peckham, and then for its successor constituency of Camberwell and Peckham since 1997.  She has served in various Cabinet and Shadow Cabinet positions and, in her role as Deputy Leader of the Labour Party, she was twice the Acting Leader of the Labour Party and Leader of the Opposition: from May to September 2010 and from May to September 2015.  She remains the only politician to have held this position on two separate occasions.

Labour Party (UK) Shadow Cabinet election, 1995: Elections to the Labour Party's Shadow Cabinet took place in October 1995, at the beginning of the 1995/6 session of parliament.  Under the rules then in effect, the Commons members of the Parliamentary Labour Party elected 19 members of the Official Opposition Shadow Cabinet, who were then assigned portfolios by the leader.  The Labour peers elected the Leader of the Opposition in the House of Lords.  In addition, the Leader of the Labour Party and Deputy Leader (Tony Blair and John Prescott, respectively) were members by virtue of those offices.  With this election, for the first time, the role Opposition Chief Whip was simply another portfolio to be handed out rather than an office separately elected by the PLP.  The 19 elected members of the Shadow Cabinet were the ones with the largest number of votes.  MPs were required to vote for at least four women, but women were not necessarily guaranteed places in the Shadow Cabinet.

Ed Miliband: Edward Samuel Miliband (born 24 December 1969) is a British politician who was Leader of the Labour Party as well as Leader of the Opposition between 2010 and 2015.  He became the Member of Parliament (MP) for Doncaster North in 2005, being re-elected in 2010, 2015, and 2017, and served in the Cabinet from 2007-10 under Prime Minister Gordon Brown.

Clare Short: Clare Short (born 15 February 1946) is a British politician, and a member of the Labour Party.  She was the Member of Parliament for Birmingham Ladywood from 1983 to 2010; for most of this period she was a Labour Party MP, but she resigned the party whip in 2006 and served the remainder of her term as an Independent.  She stood down as a member of parliament at the 2010 general election.  Short was Secretary of State for International Development in the government of Prime Minister Tony Blair from 3 May 1997 until her resignation from that post on 12 May 2003.  Shortly before her retirement from Parliament in 2010, she was strongly rebuked by her own party when she announced her support for a hung parliament, a situation which subsequently occurred at the 2010 General Election.

Labour Party (UK) Shadow Cabinet election, 1994: Elections to the Labour Party's Shadow Cabinet took place in October 1994, at the beginning of the 1994/5 session of parliament.  Under the rules then in effect, the Commons members of the Parliamentary Labour Party elected 18 members of the Official Opposition Shadow Cabinet, who were then assigned portfolios by the leader.  The Commons members of the PLP separately elected the Chief Whip, and the Labour peers elected the Leader of the Opposition in the House of Lords.  In addition, the Leader of the Labour Party and Deputy Leader (Tony Blair and John Prescott, respectively) were members by virtue of those offices.  The 18 elected members of the Shadow Cabinet were the ones with the largest number of votes.  MPs were required to vote for at least four women, but women were not necessarily guaranteed places in the Shadow Cabinet.

Supporting paragraphs: Marion Kozak Ed Miliband
Answer: Doncaster North