According to the National Trust, kids are increasingly out of touch with the countryside. They're far more likely to be able to recognise a Dalek than an oak leaf.
Looking at this photo of a Dalek now, it's seems extraordinary that they once terrified me as much as they did. I mean, all you'd need to do to outwit them is walk up some steps.
They couldn't conquer anywhere - except, I guess, the Fens.