Question: What is the name of this centre-left political party in the United Kingdom, in which Gavin Shuker serves as the Chair?
Sentence (from "Gavin Shuker"): Gavin Shuker (born 10 October 1981) is an English Labour Co-operative politician, who has been the Member of Parliament (MP) for Luton South since 2010.
Relevant evidence: Yes