Dear 100 Hour Board,
I had heard Board Question #22856 asked before to my dad who is in the stake presidency back home. Since I knew he would have the answer I emailed him to ask what he thought. His answer was this:
In a priesthood leadership meeting about a year ago for stake presidencies and stake patriarchs President Hinkley instructed us that the stake patriarch should be referred to as 'Brother Southwell' (in our specific case) out of respect for the office.
Other than full time missionaries and bishop's you don't see anyone referred to by Priesthood office. You will notice that even when conducting general conference President Monson will refer to himself as "Brother Monson" (as in, President Hinkley has asked that I, Brother Monson, conduct this session of conference). The Apostle's are referred to as Elder or Brother, not Apostle Oaks or Ballard. Members of the Seventy are referred to as Elder, not Seventy or High Priest.
I usually try and refer to former bishop's as 'brother' to avoid confusion. There was a girl that was baptized into the YSA ward in our stake and she felt very silly once she realized that our High Council representative, Rick Olson, was not Bishop Rick (bishopric). The confusion came from everyone referring to all members of the bishopric as "Bishop So-and so" because they were all former bishops.
Hope that helps!!