A little while ago, I posted on here about putting a woodburner in a recently-uncovered 1920s / 1930s fireplace.
It looks like the best way to go is in fact to take out the fireplace and enlarge the opening, but perhaps use similar tiles to surround the new opening.
The only thing is that the current tiles are - to the nearest cm - 15 cm x 5 cm, which doesn't seem to be a normal size for anything except borders. They have really good proportions for the task.
Can you knowledgeable people suggest any possible suppliers? Think the original fireplace was made as a 'kit' with curved tiles round the opening and identical tiles forming the hearth.
Like this but a nicer colour - a sort of bluey grey: