Question: Who is this British politician and former Prime Minister of the United Kingdom who also contributed to the policy-making system of the Labour Party?
Sentence (from "Premiership of Tony Blair"): Whilst serving as Prime Minister of the United Kingdom, Blair concurrently served as the First Lord of the Treasury, the Minister for the Civil Service, the Leader of the Labour Party (until Gordon Brown was declared Labour leader on 24 June 2007), and a member of parliament for the constituency of Sedgefield in County Durham.
Relevant evidence: No