I personally like the brick fireplace, but I can see the need for a mantle. If you don't like the brick facing I would maybe clad the two sides and top with a steal, maybe stainless but probably something a little more rustic, this could then appear to hold the mantle which I would do in a reclaimed oak or something to match the shelves in your living room. I would then remake the shelving to the left in the same material, possibly add lighting and a little shallower, I would also add a modern log basket, I agree that shouldn't touch the stone as it goes through the rest of your home, by the way the rest of your home looks great!

Your surround is probably from the 1930's. There are some interesting tile patterns from that period that would go well with your surround. Look in architectural salvage yards, armed with the dimensions of the opening within the surround. You might be lucky enough to find a copper or cast iron insert-basket. Also, instead of keeping your surround white, consider a deep beige or cafe colour to create a focal point in the room. I would consult a local firecentre regarding a basket for solid fuel or the installation of a gas basket. https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTT_IQ7jmkd-NMnaXCxmAs12WYP59IFZAqaBqReho8kPDkwG_fE http://www.c20fireplaces.co.uk/repro-fireplace-insert/rfpi006_craddock-art-deco-tiled-fireplace-insert

Ooo thanks so much for the response. I love these ideas. I prefer the soft white look of the limestone. But the Carrara marble would be more authentic to the era. So it’s tough to decide. Particularly like the last fireplace surround on your first post (the London fields house). That looks to be a Carrara marble. Do you think that option would go with our fireplace insert tiles? As the carrara has grey flecks in there. Closer up image of the tiles below - the base colour in the tiles is a dark brown. Thanks

I would only keep it if you were to replace the mosaic tiles with something graphic and stylish such as cement tiles or similar. I would remove them and see what you have in term of thickness, probably not much as it looks like they have stuck them over the top of whatever is underneath. If you don't remove them you could paint the tiles off white and do some folk art treatment on the wood.