Thanx a lot for the link. That reading is very informative. I'm not so sure about these two points:

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You never have to surrender your camera or other equipment to any official without a court order (UK).
You never have to delete your photos or modify any of them or your equipment (UK).
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I suppose the laws of every country may differ.

I also have to investigate what exactly is considered a public place. A mall is a public place?