Firstly, JW411, sorry to hear of Peter Moore's passing.
Secondly, as it was I that drove Peter to inspect said 'hole' that very day after the landing, it was an unfortunate hole in the proverbial Swiss cheese; mutli-layered management (museum full-time staff and volunteers included) which took the belief that all of the tree holes had been filled. Both practice approaches were spot on for the concrete, though on the final approach the aircraft contacted the grass south of the road onto the road surface, then bounced onto the grass on the northern edge and then onto the runway.
As others have pointed out, this hole was actually one of many obstacles of flying such an aircraft into a small strip. The numbers of folk commented upon by Two Sheds were under strict control, either being escorted press or those with a need to be there; even in the 1990s there was such a thing as risk management. Of course by today's standards, it's unlikely the such an operation would be approved - the last flight of the Vimy in 2009 being a case in point.
Having been there, seen it and felt HUNTING SUPERB as she thundered to a halt that day, it was a privilege to have been part of it and 16 years later can still assure you that the preparation and execution was as safe as it could have been.