To answer a couple of questions...
Headphones - you can't hear what the conductor is saying very clearly from the organ loft during rehearsals, so the headphones help a lot. They are linked to the pair of microphones permanently suspended across the Quire for recording the organ and choir.
Organ Scholar - we re-jigged the Music Department jobs from Autumn 2007, losing the Organ Scholar position and creating a 2nd Assistant post. This was for various reasons, including the difficulty we had in finding Organ Scholarship candidates and the need (highlighted way back in the In Tune with Heaven report) to ensure that we weren't relying on the Organ Scholar for essential routine staffing in the music department. It would be great in the future to resurrect the Organ Scholarship (in addition to the 2nd Assistant's post), as it's a wonderful way for someone to immerse themselves in the cathedral-music-thing for a year. But these things all cost more money sadly...