Question: Harrow west has returned the Labour Co-operative who joined what?

Documents:
source: Gareth Thomas (English politician)
text: Gareth Thomas (English politician) Gareth Richard Thomas (born 15 July 1967) is a British Labour Co-operative politician who has been the Member of Parliament (MP) for Harrow West since 1997 and the Chair of the Co-operative Party since 2001. Thomas held the position of Minister of State at the Department for International Development and, following the 2010 election, joined the shadow frontbench team.

source: Harrow West (UK Parliament constituency)
text: Harrow West (UK Parliament constituency) Harrow West is a constituency created in 1945 represented in the House of Commons of the UK Parliament and which has returned the Labour Co-operative MP Gareth Thomas in the five General Elections from 1997 having previously returned Conservative MPs.

source: Huddersfield (UK Parliament constituency)
text: Huddersfield (UK Parliament constituency) Huddersfield is a constituency represented in the House of Commons of the UK Parliament since 1983 by Barry Sheerman of the Labour Co-operative Party (which denotes he is a member of the Labour Party and Co-operative Party, one of 27 current Labour MPs, and requires members to contribute practically to a cooperative business).

source: Val Shawcross
text: Val Shawcross Valerie Shawcross CBE is a Labour Co-operative politician and Deputy Mayor of London for Transport. She was a former member of the London Assembly for Lambeth and Southwark, between May 2000 and May 2016, when she voluntarily stood down. Shawcross was the Labour Co-operative candidate for Bermondsey and Old Southwark at the 2010 general election.

source: Dickson Mabon
text: Dickson Mabon Jesse Dickson Mabon PC FRSA (1 November 1925 – 10 April 2008), sometimes known as Dick Mabon, was a Scottish politician, physician and business executive. He was the founder of The Manifesto Group of Labour MPs, an alliance of moderate MPs who fought the perceived leftward drift of the Labour Party in the 1970s. He was a Labour Co-operative MP until October 1981, when he joined the Social Democratic Party. He left Parliament in 1983, after being defeated, and rejoined the Labour Party in 1991.

source: Batley and Spen (UK Parliament constituency)
text: Batley and Spen (UK Parliament constituency) Batley and Spen is a constituency represented in the House of Commons of the UK Parliament since 2016 by Tracy Brabin, a member of the Labour Co-operative Party (which denotes she is a member of the Labour Party and Co-operative Party, one of 27 current Labour MPs, and requires members to contribute practically to a cooperative business).

source: Leicester South (UK Parliament constituency)
text: Leicester South (UK Parliament constituency) Leicester South is a constituency, recreated in 1974, represented in the House of Commons of the UK Parliament since 2011 by Jon Ashworth of the Labour Co-operative Party (which denotes he is a member of the Labour Party and Co-operative Party, one of 27 such current Labour MPs, and requires members to contribute practically to a cooperative business). A previous version of the seat existed between 1918 and 1950. Except for a 2004 by-election when it was won by the Liberal Democrats, Leicester South has been held by the Labour Party since 1987.

source: North Harrow
text: North Harrow North Harrow is a suburban area of North West London, situated north-west of central Harrow within the London Borough of Harrow. Its residential roads have expanded from North Harrow tube station, a station on the Metropolitan line of the London Underground which is one stop away from Harrow-on-the-Hill station in Harrow town centre. Before North Harrow tube station was opened and the suburb developed, the area was originally known as Hooking Green.

source: Neil Bibby
text: Neil Bibby Neil James Bibby (born 6 September 1983) is a Scottish Labour Co-operative politician. Bibby was elected to the Scottish Parliament in 2011 to represent the West of Scotland region, as the Labour Party returned three members from the list.

source: Harrow, London
text: Harrow, London Harrow is a large suburban town in the London Borough of Harrow, northwest London, England. It is centred 10.5 mi northwest of Charing Cross. Harrow-on-the-Hill includes the conservation area with a high proportion of listed buildings with a residential and institutional array of Georgian architecture and a few 17th century examples. Harrow gives its initial letters to a wider postcode area. The administrative offices of the borough are in the town which currently is made up of the Headstone North, Roxeth, Marlborough, Greenhill, Headstone South and West Harrow electoral wards; these had a population of 80,213 in the 2011 census. Harrow was a municipal borough of Middlesex before its inclusion in Greater London in 1965. Harrow is home to a large University of Westminster campus and its oldest secondary schools are Harrow School and Harrow High School.

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Answer: shadow frontbench team