This is a really interesting topic. I actually just finished a course on mass media law, although that was only on the policies in the United States.
I obviously can't speak for the UK, but I'm the US if you consent to having your photo taken in a booth, or at the DMV the photo is public domain. That being said the photo is understood to be for official use only, so you shouldn't expect to see it anywhere but where it should be.
Photos like these fall under tacit consent laws as I'm sure you don't remember signing a contract with the DMV about a photo.
The US doesn't have a policy for animal selfies either, in part I think to the fact that selfies weren't a thing until recently. If I had to guess though I imagine courts here would side in favor of the photographer. His camera, his "film", his picture. The picture is not public domain because he subject in question, "curious monkey", doesn't have the ability to consent to having it's picture taken or published and can thereby not be considered as a determining factor for ownership of the photo.