This is the composition I had gone up y Cribau to shoot, once at sunset and once at sunrise in the morning.
It is realitely straightforward to plan snots like this using a map alone in areas of dramatic landscape. In this case I wanted to shoot Snowdon and this location to the SW of the mountain looked like a good location for a view. Of course I still needed a foreground and pools are marked on the OS map. In that way you can plan a composition you have never seen before, or at least get a pretty good idea!
I didnt quite get the light I was after, but the 10 seconds of light I had (and thats 10 seconds in 3 freezing hours in the morning!) was just enough. The wind was NW and the clouds were forming over the mountains and blocking the sun, which was a shame. At least the light is quite unusual.