Long thin white objectI was sitting in my back garden enjoying the sun. The weather was warm and sunny but it was very hazy. I heard the sound of a helicopter or old prop plane. I looked up and around to see what it was. My house is under a well used fight path, so aircraft are not unusual. I looked up and I saw a long straight white object moving in a purposeful way(not drifting), in the direction of its end. It was very thin, as if they was no way anyone could be inside. There were no appendages or patterns of any kind. It moved as fast as a plane appears when it is below cloud level and coming into land but it seemed to be just above the level of the haze cloud which would have been about 20 000 feet. It became very hard to see as it blended into the cloud and got lost in the sunlight. I lost sight of it but I continued to look South in the direction it had gone. Then after a few seconds I saw it appear out of the bright white haze as something darker, but this was too brief to say anything else. A few milliseconds after it reappeared as a darker object, it flashed brightly. The flash was not like a white light but appeared to be a strong reflection off a metallic object or an electrical spark maybe.. It was the length of a dime or U.K. 5p piece held at arms length. It had similar proportions to a matchstick. I should also mention that I did have my shiny new rebel xt\350d at the time and I ran inside to get it. But I am embarassed to say that I accidentally had +2 stops exposure compensation set. At the time I was confident I had good pictures but when I downloaded the images I could not see a thing. I have attached one of the pictures that would have been taken around the time it reappeared.