Milk Hill UFO incident, 1990 - Strange ball of light

The below footage shows an aerial footage of a strange ball of light floating above the fields.



Here's the description of the video posted by the publisher:-

"On July 29th 1990, I filmed a ball of light close to two crop circles near to Milk Hill in Wiltshire. This was the first time that a ball of light had been filmed close to crop circles.
The ball of light came into view and dropped into the crop. At the time I thought it might be a bird or a balloon, or something else mundane. But it became clear after a while that it was something more bizarre! The light moved through the crop flashing and glinting (like sunlight reflecting off of tin foil) The light at times was very intense! Eventually the light took off and flew towards a tractor driver in the distance. As the ball of light flew over the tractor, the tractor stopped. Eventually the ball of light went off into the distance.
The tractor driver was interviewed about five months after the incident, and he said he remembered that day, and the ball of light which he saw fly over him. He said that it was as big as a beach ball and was glinting and flashing! He said that he does remember that the engine stopped as the light went over the tractor. At the time of the incident he did hot know that I was filming from my vantage point on Milk Hill.
When he informed his boss at the farm, and his friends of what he saw , he was not taken seriously and was laughed at. When the film of the event was put out to the public, it confirmed that he had indeed seen something that was very strange indeed.
Since that day many people have filmed similar objects in and around crop circles. I filmed another one in 2009, which shot into the floor lay of the formation at Morgan's Hill in Wiltshire. What these objects are is still unknown. They seem to move with propose, and seem to have some kind of intelligence. Some people believe that they are connected to the creation of the crop circles.
I think there is a connection, but what it is seems unclear. If these balls of light do not make crop circles, then they do seem attracted to them for whatever reason.
Steve Alexander January 2010."