I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Quite an easy walk up to Llyn Llydaw on the Miners Track (even for me with a lung missing lol). Park at the Pen-y-pass car park at the top of the Llanberis Pass (A4086). The views of Snowdon are spectacular. From Llyn Llydaw you can stride out and continue the ascent of the mountain if you have the energy (and water!).
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.