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gillies
@gillies I replied to you on the locohome chat too - oh hai 😃
To me it looks like someone has added a load on concrete to block the fireplace up at some point, and the impression on the concrete is what looks to be the old fire closure panel or similar.
If you're a bit unsure about an SDS, maybe try a bolster chisel around the edges and you might find it starts to come away. That said I can't see any reason removing it would cause an issue as it doesn't look like it suppose to be there given its a chimney.
Do you have a photo of the chimney from a further way point? To understand what's above it?