If thechimneysweep is in the house, there’s a customer in the lobby with a question.
These days, by 10:30 PM I'm always in the house. My house. Asleep. Just can't party to the wee hours with the BG man no mo.
If the Tile Fire in question has a push-pull bypass lever above the door at upper right, it never had firebricks.
UNLESS.. it is one of the briefly-available "LEM" models, which came with a box of firebricks to line the firebox. There were no clips for the side bricks, and no second tier. You stood the bricks up around the perimeter, then installed the floor bricks to lock them in place. The bricks increased the temperature at coal level, and cut the emissions to meet US Phase I standards.
Despite his penchant for late-nite carousing, BG still manages to hit the nail on the head with amazing regularity. The next-generation Ultima model, which was designed to meet EPA Phase II standards (and replace the short lived LEM model), was lined, but with proprietary cast refractory panels which extended all the way up the sides to support an arched cast refractory baffle.