UK Law

You can film or take images of adults, children, and anything visible from a public space.
No permission is required to take photos in public spaces.
No one, apart from a judge with a warrant, can make you delete images.
You can stand anywhere in a public or private space, as long as it is publicly accessible.
There is no privacy in public spaces.
You can take images from a public space of a private space or land.
You can upload and publish images taken in public spaces without consent, as long as the content does not violate any laws (e.g., indecency or harassment laws).

Misconceptions:

You cannot film people in private spaces: False. As long as it's from a public space, you can film what is visible (e.g., through windows).
It's illegal to photograph children without permission: False. There's no law requiring permission unless you intend to sell the photos or use them commercially.
You must delete images if asked: False. Only a judge can force you to delete images, not private individuals or security.
You can't publish images of people without their consent: False. If the photo was taken in a public space, you generally don't need consent to publish it, as long as it doesn't violate any laws.