Question:  Call Me Dave: The Unauthorised Biography of David Cameron is a 2015 book by  the 74th richest person in the UK, as ranked by what?
Sentence (from "Call Me Dave"): Call Me Dave: The Unauthorised Biography of David Cameron is a 2015 book by Michael Ashcroft, a businessman and Conservative peer, and Isabel Oakeshott, a political journalist, about the then Prime Minister of the United Kingdom, David Cameron.
Relevant evidence: Yes