Doctor Who (2006) Easter Egg - Pink Floyd "Animals" Reference

@ 14:05 The Doctor refers to the people of London as Sheep as they walk into the Battersea power station to be converted into Cybermen.

This plus the Zeppelin (a big Balloon) floating above Batersea is a reference to Pink Floyd's Album Animals.

A Pig is seen floating above Battersea on the album cover, and one of the songs "Sheep" is about the people of london being led to the (perverbial) slaughter by the government.