That Missy was up to no good as usual. She had loaded Napoleons Nose above the Cavehill in Belfast with a legion of flesh eating nano-bots! One sneeze from that stoney orifice and the greater part of Belfast would be dinner for swarms of little man eating robots. For Rassilon's sake what ever happened to straight forward extinction level invasions by Daleks and Cybermen. Its like the universe is ruled over by Monty Python's Flying Circus.