observed small ufo hovering over a field/farmhouse moving in a random fashion in all directions

on our way home from nottingham in the early hours of the morning on a very bright (full moon) summers night we were chatting in the car and watching casually out of the windows.i looked out to the left of the car and observed a strange object that appeared to be hovering .being in motion and with the car passing trees and shrubs by the side of the road (we were in the countryside)it was difficult to get a good view of what it was.my friend who was driving glanced in the direction of this thing and neither of us could make out quite what it was so i got him to pull over to the side of the road so that we could take a closer look.we exited the car but still couldn't quite see it clearly enough because of the shrubbery so we climbed on top of the car.still a bit bemused by it all we stared in the direction of this thing and when our eyes had a chance to adjust to the light we both observed a disc shaped object with three lights across its centre red white and green.it was across a field some 100 yards away. thanks to the fact that there was a farmhouse close by we got a very good idea of size which i would put at only 8 to 10 feet across and maybe some 6-7 foot high .it did not appear to be spinning and was completely silent. it hovered in one position for several minutes then moved very randomly up and down left and right, sometimes in a figure eight yet it didn't move any great distance.it didn't move any more than 40 yards than it's original position. we just stood amazed. it was inthe same area as i said to a farmhouse and at first we thought it must be attatched to the high cables coming from the building but when we watched it move we realised this was impossible.it moved very slowly.after watching it for maybe 20 -25 minutes i got anxious and wanted to take a closer look. my idea of walking across the field to investigate it was met by a brick wall from my friend. this whole event had somewhat disturbed him , he was quite obviously frightenend by whatever it might be and being an absolute disbelieve! r of anything on this subject he just wanted to get out of there. i tried to talk him into it but there was no chance.he got panicky and told me to get in thre car. when i did he sped off.i watched the broken vision of the object still hovering through the back window and to this day i wish i had been stronger willed and gone on my own to see what this thing was.we got such a close clear look at it. being a non driver at the time i had no idea where exactly we were  and would love to go back to ask the people living in the farmhouse if they had experienced anything. i still live within 20 miles of where this must have happened.