 In 2004, Top Up TV launched on Multiplex A, though it sub-let its capacity from Five, and not SDN directly.Multiplexes A and 2 were the only options for Top Up TV as the regulations set out by Ofcom directed that only free-to-air television channels could be broadcast on multiplexes 1, B, C and D, despite there being available space on some of those multiplexes.This regulation has since been lifted.