My MIL just phoned me and she has been tormenting the life out of herself trying to find out this nursery story/rhyme (sp?)
Its something from a story called Once Upon A Time. This story is about a boy, mum, dad and their cat moving home. In the story, references are made about a story of a witch that can't keep her balance on her broomstick. There are other stories mentioned like goldilocks and hey diddle diddle. My MIL said no-one seems to know the witch one though. I will search on the internet later but thought I'd ask here incase anyone knows it.