In Hainault Forest, the team employed to take care of the trees have been told to take down any dead tree that might fall across a well-travelled pathway. Most of these are really old oaks.
Like this one.
You can get an indication of the size of the bole compared with Draco, who stands about 13 inches at the shoulder.
Mind you, the very next day we found a fallen tree blocking the 'monster walk'...