The problem with restoring a period fireplace is almost never the chimney breast. It is finding a reproduction that does not look like a reproduction.
Most cast iron fireplaces on the market today are flat, thin, and stamped out at speed. Drop one into an Edwardian room and it reads immediately as a compromise.
The Carron Valentine takes the opposite route. It is a faithful Art Nouveau design from around 1900, built around a prominent canopy and a frieze carrying a large pomegranate motif that flows down into the legs. The serpentine bars complete the silhouette. It is cast iron, not pressed steel, so it holds detail and heat the way the originals did, and it carries a 3 year guarantee.
Practical side, since that is where most projects stall:
It runs on solid fuel or gas. Burning wood or coal means adding an ashpan, and a solid fuel fire brick is worth ordering to protect the back if you use it often. Prefer flames without the mess? A NuFlame gas insert gives you coals and a real flame picture.
Hearths matter more than people expect. Decorative or gas use suits a one piece granite hearth. Burning solid fuel requires a four piece hearth.
Tiles are sold separately, so you can match the surround to your own scheme rather than settling for a bundled set.
Measure twice. Order once.https://www.periodhousestore.co.uk/carron-valentine-cast-iron-fireplace.html