I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
I parked in Chirk Bank next to the canal and walked to the public footpath with views of the Aqueduct and Viaduct a short walk away. The footpath crosses a large field which unlike the aqueduct was nice and quiet.
Canal and River Trust link: Chirk Aqueduct | Places to visit | Canal & River Trust
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 24/08/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.