Just a heads up, there has been a significant roof fall at the "daylight" entrance in Cambrian slate mine. A large block has decided it was bored with being part of the roof, and wanted to be part of the floor. It has come down directly on the path used to navigate this chamber, near the small hut. As usual, this will probably entice other falls, so care should be taken in here, and ideally, the front part of the chamber avoided altogether, using the Pipe as the entrance.