I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
The Avon Viaduct carries the railway over the River Avon at Linlithgow, West Lothian, Scotland and was built in 1839-1841. The 442 yard 23 arch bridge has two Historic Environment Scotland listings and is a category A listed building.
There is a small layby on the B825 (marked by the pin) where you can park with open fields between there and the viaduct.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 01/09/2021. It remains the responsibility of any pilot to check for any changes before flying at the same location.