Who is Mr. Blunt from Stormbreaker and what is their importance?

Mr. Blunt is the chief executive of the Special Operations Division of MI6. Mr. Blunt is a cold, calculating man who has no problem sending a fourteen year old child into a case that will more than likely end his life. Mr. Blunt has his eye on the prize, the need to make sure the security of the nation is ensured, not a single life. For this reason, Mr. Blunt blackmails Alex into taking on the case that his uncle was killed over even though he knows that Alex will more than likely be killed. In fact, Mr. Blunt expects Alex to be killed and he hopes to use Alex's death to force a larger investigation of Herod Sayle.