Hi i have attached a map of the area i am talking about, top of the picture (red) is HMP Edinburgh and the bottom left (blue) is the Lothian buses Depot. Also on my app fly safe it says i cannot and on another app it does not mention it.
Yep, it’s a no fly zone, according to drone scene only up to 164ft in height (50m). Just fly at 55m when dropping your contraband 
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I used to know a chap lived 10 miles outside of Edinburgh in the early 60’s who would break into Saughton Prison, if he knew he was going down for a few months and hide tobacco within the grounds. ( he was the drummer in my dads Scottish Country Dance Band)