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Sue Gray's salary has been revealed to be higher than that of the prime minister's. As a salary, £170,000 is many times higher than the national average, but considerably less than plenty of people, some in the public sector and many in the private sector, would earn in a position of equivalent seniority. Our Political Editor Chris Mason explains how he and his team brought you the story about the salary of the prime minister’s chief of staff, why they did, and why it matters.(Credit: Phil Coombes)