This is what we inherited when we bought the house. That is actually York stone, and the mantel shelf is a solid piece of slate. All saved to be re-used somehow.
Stage one of dismantling complete.
Found this in the next layer of brick?
We took the plywood arch down.
And found a scrap of amazing wallpaper behind it.
And the finished result!
Still need a fire surround making and installing, but we now have a much improved room. Carpet down, furniture in, bookshelves and most importantly a lovely warm woodburner. We've started spending our evenings in here again now instead of the living room!