When you think of ancient trees you may imagine centuries old oak trees in Windsor Great Park, or Sherwood Forest. But ancient trees can be found everywhere and there are large numbers of undiscovered ancient trees in urban locations such as formal parks, old deer parks, and estates. Why are ancient trees important? Where are London's oldest Mulberry trees? What role can they play in a modern urban environment?

Join the discussion with experts David Humphries, Peter Coles and Greg Packman.