BBC
Psychoville, whose first series was made on such a low budget that one episode was filmed in one room in one take (having the additional benefit of being an homage to Rope), used all the extra cash thrown at it to horrifying effect in its second series finale. A Jacobean plot, with a revivified cryogenically stored Nazi's head and a cremation while alive, was animated with the best technology licence fee payers' cash can give, and instead of being chucked up the wall, it gave TV's creepiest series a fine send-off.