Question: In regards to the person who was a Member of Parliament for the Leigh constituency before Jo Platt, what year was that person born?

full_context: Document 1: Leigh (UK Parliament constituency): Leigh is a constituency in Greater Manchester represented in the House of Commons of the UK Parliament since 2017 by Joanne Platt of the Labour Party.
Document 2: 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.
Document 3: Andy Burnham: Andrew Murray Burnham (born 7 January 1970) is a British politician and the Mayor of Greater Manchester, in office since May 2017. Burnham was previously the Member of Parliament (MP) for Leigh from 2001 to 2017. He is a member of the Labour Party.
Document 4: Mayor of Greater Manchester: The Mayor of Greater Manchester is a directly elected political post responsible for the strategic government of Greater Manchester, including health, transport, housing, strategic planning, waste management, policing, the Greater Manchester Fire and Rescue Service and skills. The creation of the Mayor of Greater Manchester was agreed between the then Chancellor of the Exchequer, George Osborne, and Greater Manchester's 10 district council leaders. As well as having specific powers, the Mayor chairs the Greater Manchester Combined Authority, also assuming the powers of the Greater Manchester Police and Crime Commissioner. Tony Lloyd was appointed as Interim Mayor for Greater Manchester on 29 May 2015.
Document 5: 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.
Document 6: Greater Manchester Police and Crime Commissioner: The Greater Manchester Police and Crime Commissioner was the police and crime commissioner, an elected official tasked with setting out the way crime is tackled by the Greater Manchester Police in Greater Manchester. The post was created on 21 November 2012, following an election held on 15 November 2012, and replaced the Greater Manchester Police Authority. Upon the creation of a Mayor of Greater Manchester and the inaugural election to that position, the duties of Greater Manchester Police and Crime Commissioner were absolved into the mayoralty and the office itself abolished. For the entirety of its existence, the commissioner was Labour Party politician Tony Lloyd. The police and crime commissioner was required to produce a strategic Greater Manchester Police and Crime Plan, setting out the priorities for the Greater Manchester Police, and their work is scrutinised by the Greater Manchester Police and Crime Panel. In November 2014 it was announced that the role would be replaced with a directly elected Mayor of Greater Manchester, and the term of office of the incumbent commissioner was extended to May 2017.
Document 7: Diane Abbott: Diane Julie Abbott (born 27 September 1953) is a British Labour Party politician who was appointed Shadow Home Secretary in October 2016. She was first elected as the Member of Parliament (MP) for Hackney North and Stoke Newington at the 1987 general election, when she became the first black woman to hold a seat in the House of Commons.
Document 8: Ian Murray (British politician): Ian Murray (born 10 August 1976) is a British Labour Party politician who has represented Edinburgh South as Member of Parliament (MP) since the 2010 general election. He served as an Edinburgh City Councillor for Liberton & Gilmerton Ward from 2003 to 2010, before his Westminster election as an Edinburgh MP. From 2015 to 2017, Murray was the only Labour Party MP representing a Scottish constituency in the House of Commons.
Document 9: Jo Platt: Joanne Marie Platt is a British politician who represents the Labour Party. At the 2017 general election, she was elected Member of Parliament for the Leigh constituency succeeding Andy Burnham who left Parliament to become the Mayor of Greater Manchester. She is Leigh's first female MP. On July 13, 2017, she became Parliamentary Private Secretary to Angela Rayner.
Document 10: Ashton-under-Lyne (UK Parliament constituency): Ashton-under-Lyne is a constituency centred on the town of Ashton-under-Lyne that is represented in the House of Commons of the UK Parliament since 2015 by Angela Rayner of the Labour Party, who has served as Shadow Secretary of State for Education since 1 July 2016 and Shadow Minister for Women and Equalities since 27 June 2016.
Document 11: 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.
Document 12: Andy Burnham Labour Party leadership campaign, 2015: Andy Burnham Labour Party leadership campaign, 2015
Document 13: Angela Rayner: Angela Rayner ("née" Bowen; born 28 March 1980) is a British Labour politician.
Document 14: Glen Murray (politician): Glen R. Murray (born October 26, 1957) is a Canadian politician and urban issues advocate. He served as the 41st Mayor of Winnipeg, Manitoba from 1998 to 2004, and was the first openly gay mayor of a large North American city. He subsequently moved to Toronto, Ontario, and was elected to the Legislative Assembly of Ontario as a Liberal Member of Provincial Parliament (MPP) for Toronto Centre in 2010, serving until 2017.
Document 15: Richard Leese: Sir Richard Charles Leese, CBE (born 21 April 1951) is a politician in Manchester, England. He has been the leader of Manchester City Council since 1996 and a member of the Labour Party since 1984. On 6 May 2017, Leese was appointed Deputy Mayor for Business and Economy by Greater Manchester Combined Authority Mayor, and former Shadow Home Secretary, Andy Burnham.
ground_truth: 1970