Yes, it looks like a Mira one. Using a flat bladed screwdriver, or similar, prise in between the tiny gap and push it down (indicated on edited photo), this should hen reveal a screw.
The grey coloured end bit will be concealing the screws.
It will slide off, either downwards or forwards away from the wall.
Although a sharp tap with a hammer would suffice if necessary.
Yes, it looks like a Mira one. Using a flat bladed screwdriver, or similar, prise in between the tiny gap and push it down (indicated on edited photo), this should hen reveal a screw.