Question: Which region did this son of Marion Kozak and British politician who was Leader of the Labour Party and Leader of the Opposition in the 2010s, represent as Member of Parliament in 2005?
Sentence (from "Marion Kozak"): In 1961 she married Ralph Miliband (1924–1994) and their two sons, David Miliband and Ed Miliband, have risen to prominence in modern-day British politics.
Relevant evidence: Yes