Question: What party was both, Harold Macmillan and Keith Joseph apart of?
Sentence (from "United Kingdom general election, 1959"): However, despite this success, the Conservatives failed to win the most seats in Scotland, and have not done so since; this marks the beginning of Labour's domination of Scottish seats at Westminster, which lasted until the rise of the Scottish National Party at the 2015 general election.
Relevant evidence: No