I remember that. In October of each year, early 1960's, we used to cycle from the Oval, looking for conkers, to Mitford via Nedderton, Hepscott and Morpeth. There were two groups of Horse Chestnut trees in Nedderton - first on the left as you rode through from Bedlington and I think they were next to a farm house or farm buildings and the second group was on the right outside Netherton Hall. The next place was one my older brother and his mates took me to, Hepscott Manor & cottages ,but they didn't tell me what the buildings were used for just that I had to keep quiet and hide every time someone came along the road.
Think it was probably three years before I realised I was hiding behind walls when blind residents were walking up and down the lane.