Hval,
In my mind the reason that they are so effective is that their objective is so simple. They are there to show the RAF, and by implication the British military, UK as a whole and our defence industry in a good light. An objective that could be achieved in any manner of ways.
The fact that they have chosen to do it using fixed wing aircraft flown superbly is a master stroke. That they then back this up with all their other engagement completes a fairly compelling picture.
So to make your paper complete it is worth, for me, identifying what it is they actually do as opposed to the means by which they do it.