They all just happen to be in Doyley Woods when Willo the Wisp is flitting about so he can tell us (through the voice of Kenneth Williams) all the adventures and mishaps that befall them.
It bought back so many memories of when I used to listen to it. Now my daughters think its great. Highly recommended to listen too.
Charming (I think Kenneth Williams narration always is) but not as good as I remember from childhood.