Mostafa,
The workings of Khaki Command always puzzle me, but according to the press release:
Sergeant Major Haughton was selected for Late Entry Commission in 2012 and went on to put officer cadets at the Royal Military Academy Sandhurst through their paces as the Academy Sergeant Major. In doing so, he joined a select group of 30 Command Sergeant Majors in the British Army, selected from among the strongest applicants on the Late Entry Commissioning Boards. He now heads up that group as the Army Sergeant Major, providing guidance and direction from the very top of the Army, and feeding back the soldiers’ voice to Higher Command.
A bit of googling suggests appointment this was introduced in 2008ish