Mark's headache subsided after Mac2 had performed a 'brain sweep'. Mark went back for a briefing from Duncan. They had a beer or two and the session was friendly, although Mark was uncharacteristically rather concerned about what MI6 might expect of him. Clearly they wouldn't have gone to all this trouble and expense without getting some serious return on investment.
Duncan explained that Mark would have to go on occasional 'assignments' which would call for quick-wittedness, an iron fist and ruthless determination, but that from what he'd heard about Mark (in his Rufus days) it would present no problems.