"Farewell to the Ice Age. Welcome to the Tree Age. Possibly."

Chilling words (possibly), even to the most ardent of tree-huggers.

So the world is covered in trees and the TARDIS is swarming with children in the latest series 8 episode, In the Forest of the Night.

The Doctor tries to work out what's going on, Clara tries to remember she's a teacher, Danny tries to dazzle the eye(s) of the tiger and the kids try everyone's patience.

Wolves chase people (slowly), Nelson's Column droops and a missing person is found in a shrubbery.

So Jim and Martin can't help being reminded of the words of the White Guardian: "Nothing will happen. Nothing at all. Ever..."