Question:  Colin Pickthall was Labour Member of Parliament for a constituency currently represented by who?

Context paragraphs:
Sonika Nirwal: Sonika Nirwal (born 1977) was a senior Ealing Southall constituency Labour politician representing the Greenford Broadway ward.  In 2006 she was elected as the leader of the Ealing Labour group, the first Asian women to have done so in British politics, and was widely expected to succeed MP Piara Khabra as the next Labour Member of Parliament for the said constituency.

Ken Hind: Kenneth Harvand Hind, CBE (born 15 September 1949) was the Conservative Member of Parliament for West Lancashire from 1983 until 1992, when he was defeated by Labour's Colin Pickthall.  In May 1997, he was a candidate in the General Election for the constituency of Selby, but was defeated by John Grogan.

Aberdare by-election, 1954: The Aberdare by-election, 1954 was a parliamentary by-election held on 28 October 1954 for the British House of Commons constituency of Aberdare in Wales.  The seat had become vacant when the Labour Member of Parliament (MP) David Thomas had died on 20 June 1954.  Thomas had held the seat since a 1946 by-election.  The Labour candidate, Arthur Probert held the seat for the party.  He remained the constituency's MP until his retirement at the February 1974 general election.

Aberdare by-election, 1946: The Aberdare by-election, 1946 was a parliamentary by-election held on 5 December 1946 for the British House of Commons constituency of Aberdare in Wales.  The seat had become vacant when the Labour Member of Parliament (MP) George Hall had been created Viscount Hall on 28 October 1946.  Hall had held the seat since the 1922 general election.  The Labour candidate, David Thomas held the seat for the party.  He remained the constituency's MP until his death in 1954, when a further by-election was held.

Colin Pickthall: Colin Pickthall (born 13 September 1944 in Dalton-in-Furness, Lancashire) is a politician in the United Kingdom.  He was Labour Member of Parliament (MP) for West Lancashire.  He was first elected to the House of Commons in 1992, and retired at the 2005 General Election.

Bristol South East by-election, 1950: The Bristol South East by-election, 1950 was a by-election held on 30 November 1950 for the British House of Commons constituency of Bristol South East in the city of Bristol.  The seat had become vacant when the constituency's Labour Member of Parliament (MP) Sir Stafford Cripps had resigned from Parliament due to ill-health.

Liverpool Edge Hill by-election, 1947: The Liverpool Edge Hill by-election, 1947 was a parliamentary by-election held in England to elect a new Member of Parliament (MP) for the British House of Commons constituency of Liverpool Edge Hill on 11 September 1947.  The seat became vacant on the death of the constituency's Labour Member of Parliament (MP) Richard Clitherow.

West Lancashire (UK Parliament constituency): West Lancashire is a constituency represented in the House of Commons of the UK Parliament since 2005 by Rosie Cooper, a member of the Labour Party.

The Party Line (radio): The Party Line is a British radio sitcom, co-written by Steve Punt and Hugh Dennis, and produced by Adam Bromley.  It was originally broadcast on BBC Radio 4 between 2005 and 2008.  The show stars James Fleet as Duncan Stonebridge, a Labour Member of Parliament for the imaginary Rothershurst, which appears to be a marginal constituency in the north of England, one which was traditionally Conservative but turned Labour under Tony Blair.  In line with the national trend, the elections of 2005 saw Stonebridge's majority reduced to 27.  Stonebridge is a Londoner and, according to his constituency agent Roger (Geoffrey McGivern), was "parachuted in by RAF Millbank".

Swansea West (UK Parliament constituency): Swansea West (Welsh: "Gorllewin Abertawe") is a constituency of the House of Commons of the Parliament of the United Kingdom.  It elects one Member of Parliament (MP) by the first past the post system of election, and is currently represented by Geriant Davies of the Labour Co-operative party, who was first elected in the constituency in 2010.

Supporting paragraphs: Colin Pickthall West Lancashire (UK Parliament constituency)
Answer: Rosie Cooper