I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission not required.
Beautiful but rugged location. Park in car park at top of pass, along the road or in Llanberis (and get the shuttle bus). Mountains, streams, bridges, cliffs - amazing.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 15/09/2020. It remains the responsibility of any pilot to check for any changes before flying at the same location.