Stainburn Road. Leading to the industrial estate. Just at the back of the CFA. There's plenty of parking space. The large grassy knoll is set back from the smaller grassy knoll and the bushes. The bushes weren't as big then as they are now. The bushes will give you some privacy when flying your drone.
The first picture shows the gated entrance to the CFA with the grey arrow looking storage sheds in the picture. Stainburn Road is opposite.
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Small grassy knoll directly behind the bushes.
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The larger grassy knoll further back.
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It's really easy to get to as the roads go all the way around the CFA. It's worth doing a recky first of all.