Perfect reflections - Catcleugh Reservoir

When driving to Scotland on the 17th September 2009 we stopped at the Camien Cafe in the little village of Rochester, Northumberland, England for an all day breakfast. After here we headed for the Scottish Borders but before reaching the border you pass the waters of the Catcleugh Reservoir and I was stunned when passing to see the water acting like a perfect mirror. I just had to stop and then took this shot consisting of three different exposures. The amazing thing is the sky in the reflection seems to have more detail than the natural sky.