It is very noisy but essential! The plane tree in the garden has to be pruned regularly to ensure that any branches which might be in danger of dropping are dealt with before they drop on someone. This exercise involves highly-skilled tree surgeons, ropes, chain saws and a branch shredding machine parked in the Courtyard! As you can see in this picture taken by Kerry Pedrick it is quite spectacular to watch. To know that the tree is safe and healthy is worth the few hours of noise!