Paper Cake wrote...
One of the many unanswered questions. What was special about London? Why were they beaming people up to the Citadel? They clearly could make husks on the fly. Why'd they even bring the dang Citadel to Earth in the first place, let alone create the London-to-Citadel express beam?
First, they had begun full scale harvesting operations and were bringing humans up to to create a new reaper.
Second, they brought the Citadel to earth because earth was their main base of operations, and with the majority of the reapers being there they could easily fortify their position and defend the Citadel.
Dunno why I even posted that, its all explained in the game.