SFFP
Mr Ellacott was approx "100 yards" from the crash site when the Chinook overflew him and the surface visibility was " 9 or 10 ft maximum". My garden here is 100 yards long (the property precedes the French revolution and the introduction of metric measures) and a casual walk uphill from one end to the other takes less than 1 minute (including a slight detour around the swimming pool).
Furthermore, any witness at the crash site would have been at dire risk of injury or death from flying debris.