Looks like a led light cover ?
What do you mean by "dotted about on the walls"?
How were they attached/stuck to the wall? Were they just randomly placed?
Used to like themHalf of one of these?
Flying Saucers
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That part of it looks like it is for hanging something. E.g. put a screw into the back of a picture or mirror and then the head of the screw goes into the large opening and slides down to hold the mirror/picture securely without any visible hook. No idea why it would need a plastic cover though.Yeah just on a screw on the wall. You can take them off. They are in the entrance halls of each level as it's a town house.
The other side looks like this but there's absolutely nothing in the inside. I've taken in a dark room and it's not like a night light either.
It's a camera mount.
Hmm.Use circle to search on your phone and it instantly shows what it is, Arlo security camera mount.