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Thanks @craigills. I may have gone "slightly" over the maximum height allowance (130m) for some of them, but relative to the surrounding scenery, it was probably still a legal altitude.

I wont tell anyone haha. Like you say, height is relative. Depends on your reference point.

True. For example, look at the mountains in the first photo, they're "in the area", and I'm still not flying higher than them :)

Precisely. That's what I would have used as reference haha