The most important educator in most children's lives is their parents, and the first five years is deemed to be critical. Sarah Montague meets Margy Whalley, the co-founder of Pen Green Children's Centre and Research Base in Corby, Northamptonshire.

For thirty years, the centre has been educating parents about the way their children behave and learn, and using the insights of parents and nursery staff to understand the learning process of every child.

Ranked outstanding in every one of its Ofsted reports, Pen Green has influenced other centres and early years provision in the UK, and plays an ongoing role in early years research.

Presenter: Sarah Montague Producer: Joel Moors.