I've had one cast iron experience with a UFO. It was about 10 years ago. Me and the Mrs having a drink in my dads back garden in the middle of the Yorkshire Dales. It wad around midnight, pitch black and loads of stars out.
We spot this bright orange light that was still and hovering about 2 miles away over the valley.
It started slowly moving horizontally one way, then the other. This went on for about 10 minutes. We both thought it was odd but with us both being sceptics at the time, we both thought there must be a rational explanation.
Then the light just shot straight up at blinding speed and was gone. We both just looked at eachother.