I’ve researched this a few times. In the UK, if you are just sharing photos on social media or a blog etc, and the people you photograph are in public and on public land (ie not in someone’s garden or a farmer’s field etc.) then they have a reasonable right to expect to be photographed and therefore you do not need permission. Obviously, there are rules around not causing a nuisance, but casually catching someone in a scene definitely does not require consent.
However, it’s nicer to ask for consent if you can.
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