For me, there's a common misconception of what an "inversion" is and this isn't one, although a lot would class it is as one. It's actually a thick blanket of fog covering the Hope Valley. Mist is more thin and whispy and an inversion is where the clouds literally get sucked from the sky to ground level, often the height of the clouds is much higher than in this image and the temperature at valley level is often very cold while above it's really hot, hence the name "temperature inversion". Now I've got that off my chest...more about the image!
I do often wonder if the people of Castleton and Hope get fed up of waking up to foggy days, but getting a little higher and they can be treated to amazing spectacles like this one, a scene that has me running around like a kid.
After my shot from the Dale itself, it was a quick ascent directly up the side of Cave Dale to try and catch some of the first light from the tops. I've done a similar shot before but without the fog so it's nice to have an alternative.