Who are Adam Carruthers and Daniel Graham, the men due to be sentenced later for cutting down the Sycamore Gap tree on Hadrian's Wall in Northumberland? And, given they have never admitted causing the destruction that shocked the world, what might have possessed them to do it?

Two men face sentencing for cutting down the iconic Sycamore Gap tree near Hadrian's Wall in northern England. The tree stood for nearly 150 years.