There is a lot of choice of location for woods in the area in which we live, in this video we went to Panorama Woods in Ilkley. This is quite a good location in with it being close by and convenient. The trees are quite spaced apart for a wood, which makes it better for focusing on the tree in which the character is hanging.
With finding this tree with the structure in it, we are really happy with this location. The scenes of which the cars pull up will have to be filmed in a different location to this though, since it is on a hill where no cars can get to. But with editing we will have the first part with the police men getting out of the car and walking into the opening of the woods, then cut to them in the location with the tree.