Question: Which Secretary of State for Work and Pensions, who also served as the MP for Pontefract and Castleford since 1997, is associated with John Webster Robertson?

Context paragraphs:
John Robertson (Glasgow MP): John Webster Robertson (born 17 April 1952) is a British Labour Party politician, who was the Member of Parliament (MP) for Glasgow North West from 2000-2015.  Until 2010, he was Parliamentary Private Secretary to Secretary of State for Work and Pensions Yvette Cooper.

Yvette Cooper: Yvette Cooper (born 20 March 1969) is a Labour Party politician who has been the Member of Parliament (MP) for Normanton, Pontefract and Castleford since 2010, having served as the MP for Pontefract and Castleford since 1997.

Iain Duncan Smith: George Iain Duncan Smith (born 9 April 1954), often referred to by his initials IDS, is a British Conservative Party politician.  The Secretary of State for Work and Pensions from 2010 to 2016, he was previously the Leader of the Conservative Party and Leader of the Opposition from 2001 to 2003.  He was first elected to Parliament at the 1992 general election as the MP for Chingford—which he represented until the constituency's abolition in 1997—and he has represented its successor constituency of Chingford and Woodford Green ever since.

Nick Brown: Nicholas Hugh Brown (born 13 June 1950) is a British Labour Party politician who has been the Member of Parliament (MP) for Newcastle upon Tyne East since 1983.  He has served as Minister of Agriculture, Fisheries and Food, Minister of State for Work and Pensions and Deputy Chief Whip.  He has also served three separate terms as the Labour Party's Chief Whip, from 1997 to 1998, 2008 to 2010, and from 2016 to the present.  His terms as chief whip have spanned periods in both government and opposition.

Vernon Coaker: Vernon Rodney Coaker (born 17 June 1953) is a British Labour Party politician who has been the Member of Parliament (MP) for Gedling since 1997.  He also served as the Minister of State for Schools from 2009 to 2010, Shadow Secretary of State for Defence from 2013 to 2015 and Shadow Secretary of State for Northern Ireland from October 2011 to October 2013, and again from September 2015 until his resignation in June 2016 from the Shadow Cabinet.

Peter Hain: Peter Gerald Hain, Baron Hain, PC (born 16 February 1950) is a British Labour Party politician, who was the Member of Parliament (MP) for Neath between 1991 and 2015, and served in the Cabinets of both Tony Blair and Gordon Brown.  He was the Leader of the House of Commons from 2003 to 2005 and Secretary of State for Northern Ireland from 2005 to 2007 under Blair, and as Secretary of State for Work and Pensions and Secretary of State for Wales from 2007 to 2008 under Brown.  In 2007, he ran for the Deputy Leadership of the Labour Party, coming fifth out of six candidates, although his failure to declare donations during this contest led to his resignation in 2008.  He later returned to the Cabinet from 2009 to 2010 as Welsh Secretary, before becoming Shadow Welsh Secretary in Ed Miliband's Shadow Cabinet from 2010 until 2012, when he announced his retirement from front-line politics.  In 2014 he announced he would stand down as the MP for Neath at the 2015 general election.  He was nominated for a life peerage in the 2015 Dissolution Honours.  Writing in the "Guardian", he subsequently outlined his views on House of Lords reform.  He came to the UK from South Africa as a teenager, and was a noted anti-apartheid campaigner in the 1970s.  He was also Honorary Vice-President of the Campaign for Homosexual Equality.  Peter Hain is on the board of African Potash, a company with a focus on building a vertically integrated platform for the mining, production and distribution of fertiliser.

David Davis (British politician): David Michael Davis (born 23 December 1948) is a British Conservative Party politician who has been the Secretary of State for Exiting the European Union since 2016 and the Member of Parliament (MP) for Haltemprice and Howden since 1997, having previously been the MP for Boothferry from 1987.  Davis was sworn of the Privy Council in the 1997 New Year Honours, having previously been Minister of State for Europe from 1994 to 1997.

Rosie Winterton: Dame Rosalie Winterton, {'1': ", '2': ", '3': ", '4': "} (born 10 August 1958) is a British Labour Party politician who has been the Member of Parliament (MP) for Doncaster Central since 1997.  Since June 2017 Winteron has served as Second Deputy Chairman of Ways and Means.  She served under Prime Minister Gordon Brown as the Minister for Work and Pensions from 2008 to 2009, and the Minister for Local Government from 2009 to 2010.  She later entered the Shadow Cabinet in May 2010 as the Shadow Leader of the House of Commons.  In September 2010, she was nominated and elected unopposed as Labour Chief Whip and served until October 2016.  She was elected as one of three deputy speakers of the House of Commons on 28 June 2017.

Steve Webb: Sir Steven John Webb (born 18 July 1965) is a British pensions commentator who was previously Liberal Democrat Member of Parliament (MP) for Northavon, 1997–2010 and for Thornbury and Yate, 2010–2015.  He was the Minister of State for Pensions in the coalition government of David Cameron.

Andrew Smith (British politician): Andrew David Smith (born 1 February 1951) is a British Labour Party politician who was the Member of Parliament (MP) for Oxford East from 1987 until 2017.  He served in the Cabinet as Chief Secretary to the Treasury from 1999 to 2002 and then as Secretary of State for Work and Pensions from 2002 to 2004.

Supporting paragraphs: John Robertson (Glasgow MP) Yvette Cooper
Answer: Yvette Cooper