The ancient oak tree that taught the world a lesson

The remarkable Turner's oak in Kew Gardens in London not only survived the Great Storm that ravaged the south of England in 1987, but also changed the way that trees are cared for around the world.

Alejandra Martins has been speaking to Tony Kirkham, head of the Arboretum at Kew. (Photo: Turner's oak. Credit: Alejandra Martins)