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The surround should just be a fascia on the front of the brickwork. Easy enough to remove with destructive fun stuff like crowbars and lump hammers (standard PPE advice of course) but will definitely create a lot of mess/dust and require making good.
What's behind it will probably depend on the age/style of the original fireplace, either a deeper Victorian style for an old open coal fire, or maybe just a shallower recess for the back of the one visible.
There almost definitely won't be any matching timber flooring underneath that hearth - maybe concrete, potentially just compacted dirt and rubble! Unless it's really new and simply plonked on top recently.
Has anyone ever removed a fireplace surround? Have been looking at this ugly thing since we bought our house 18 months ago and now that baby is crawling I’m thinking of tearing it out to get rid of the sharp edges (we have a fireplace guard around it but it draws your eye to how ugly it is even more now), but not sure what to expect behind it.