Bit of discussion in the office todaty about where the castle by the river is. After several suggestions, I resorted to the universal search engine, G….er…Bing.
Found out its Conwy Castle in Wales.
Heres a list of where the other pictures were taken, just to be complete.
http://blogs.msdn.com/robmar/archive/2009/10/30/the-pictures-in-the-uk-windows-7-theme-pack.aspx