Jenny Randles on page 183 of her book UFO Crash Landing, says the tree damage at the landing sites is one of the “vital clues” to the case.
In that book she quotes a forester she names as James Brownlea, “one of the team from the little wooden headquarters in what is known locally as Tangham Wood” (UFO Crash Landing, page 66). According to her, Brownlea said: “I noticed that the pine trees well above the ground were broken as if something heavy had fallen through from the sky. Branches were also torn off lower down. There were signs of scorching and burning on the forest floor and a series of indentations which indicated that something solid had come down there. There was also evidence that an object may even have been dragged along the ground to remove it from the area.”