A fungi expert also shows Judi the incredible action going on beneath her feet, revealing an astonishing underground fungal network that looks up to the tips of tree roots, connecting many trees in a forest together. It's an incredible system known as the 'wood wide web'. It is confirmation for Judi that trees aren't just trees, they are a real community that help each other, humans and the planet.

Documentary series examining how trees have always been at the heart of Britain's political, artistic and economic life.