At Van in the 1990s Simon Hughes and I did an archaeological survey that involved shifting many tonnes of jig tailings that were covering parts of the old mill etc. For said purpose we obtained a self-drive mini digger that I operated and one day noticed something a bit unusual fall out of the bucket with the other stuff. It was metal and about 2ft long if memory serves me well and shaped a but like a pestle with a bulbous end. I plonked it in the back of my cab and carried on working. When the job ended it went in the back of my landrover where it stayed for some weeks rolling around with various tools, rocks etc.
One quiet afternoon, Simon decided to clean it up and take a closer look, and found that the bulbous end unscrewed....
Some time later a rather nervous policeman came to collect it and pass it onto bomb disposal. It was a spigot bomb: dropped by hand from an aircraft the steel shaft acted like a flight to ensure it fell straight and would on impact be rammed forward into the bulbous bit, initiating a detonator that would fire off a couple of pounds of high explosive.
We never did hear for sure that it was still viable, but internally it appeared to be in excellent nick. Later, the main works was commenced at Van with much bigger machinery and further ordnance turned up in the shape of a white phosphorous bomb that detonated and gave a digger driver a serious fright. The Army were summoned and did their stuff and and nearby, all together in a cluster, they found another 2-3 dozen such bombs. The one that went off was off to one side of these on its own - fortuitously!