Just seeking mumsnet wisdom as we seem to be finding conflicting info on this when we google. We have a multi-fuel stove and would like to tile the wall behind it. The hearth is already appropriately built and tiled with black quarry tiles, but the wall behind is now bare brick and I would like to tile over it. There seems to be a mix of views as to whether unglazed tiles are necessary or any tiles will do (because they are fired at high temperatures anyway). I don't particularly want quarry tiles behind the stove, I would like grey metro tiles... Any wisdom, advice or experience welcome!