UFO Sighting in Winterbourne, on July 18th 2015 – A bright silver dart shaped object shot across the sky over my back garden

I was sat in my back garden on a lawn chair having a cigarette and watching the clouds, when I noticed a bright silver dart shoot across the sky disappear for a spit second behind the clouds and then shot off in to the distance. If I hadn't been watching the clouds I probably wouldn't of seen it. It was going a lot faster than any aircraft I've ever seen and there was no noise other than the wind. There was no change it altitude or direction not even a slight weave. I don't know what I saw, I just know it wasn't a shooting star or a aircraft