What is this ‘new’ thing??

I went to change what I thought was a GU10 for a friend in a rented flat… this is what I got. An almost flat light source which appears to connect using the three screws into a bayonet-style fitting in the ceiling. I didn’t try too hard, but couldn’t remove the rest of the unit in the ceiling.

It claims 240v as you can see, but I struggle to believe this disc includes the necessary to power the LED within it. I forgot to take a photo of the other side, but basically just looks like a normal GU10 downlight.

This is in a kitchen, if you’re wondering.

So, what is this? Can I get a replacement for just the disc part? If so, what am I searching for? Looking up the SPR99901 gives me the whole unit.

If it’s possible to just replace the disc, are there smart options available?