puddle of fog

I was staying in Castleton, in Derbyshire, It was foggy in town, so I decided to try and get up high for sunrise. I went to the top of mam tor, where the visibility on arrival was pretty much zero, but as I was about to give up the clouds cleared, first over Edale, and then as the sun rose, over the hope valley where I got this shot with Castleton still covered in a thick fog inversion.