This room is under the kitchen. To judge from the cold slab, and large iron hooks I found in the ceiling, it must have been used for food storage.
To make the floor/ceiling safe, and to permit funds from the mortgage company, the rotting joists were initially repaired with bolt-on extensions which can be seen here.
The injection damp-course holes can also be seen: these were needed anyway, mortgage or not. The enormously heavy stone slab was laboriously hauled out
into the garden and cleaned up nicely to be cut into several useful pieces.
This set of images © John Woodhouse, 2005