When we first camped at Knockholt about 22 years ago, there was a different house there it was empty for years, we used to go over and snoop about, the gardens back and front were very overgrown and we found an unlocked garage with an old vintage car inside. It did feel quite eerie over there, then one year we found they had pulled the house down and were building a new one in it's place. Maybe the ghostly whistler walks Stoneings Lane by night searching for his old home and car.