Definitely more research is in order. My agent booked me in L but I was wait listed. When I called MPC to clear my wait list, the agent actually re-booked me in V class. When I called my travel to issue, she said she couldn't as, according to her, she can only issue V class ticket by pairs.
At the time, the difference in the ticket price was not enough for me to inquire further research, but reading FT got me curious.
A call to several travel agents is in order tomorrow.