UFOs or ASCs ?

[whoarmongar]

I also have seen a UFO, but it was most certainly not extraterestial.
It was years ago, perhaps about 1998, on salisbury plain about an hour before dusk.
I would describe it as fighter sized travelling at about 500 kts @ under 1000 ft.
It was black in colour with canard type layout with a very rounded bell shaped wing and canard wing, the tail was not apparent and certainly had no definite shape.
What was interesting was how the aircraft seemed to change shape as it manouvered depending on the viewers perspective also how quiet it was,in fact I didnt hear any engine noise but it never flew directly over me and at no time was I ever directly behind the aircraft.
After seeing it I just put it down to being some experimental stealth fighter or drone and thought I had had a sneak preview of a new aircraft but I have never seen a published photo of anything like it since.
I guess as it was so many years ago the technology has moved on and what I saw is now old hat. My guess is it was some flying testbed.