 However, the 19th-century ground-work for the insertion of this Victorian cellar happened to puncture through the floor of an existing 18th-century low basement room and as a consequence also excavated down to the alluvial gravels, which has had fairly dire consequences over the years with problems of flooding and slight subsidence.In the late 20th century, the ceiling of the cellar, on its upper side in the Service Hall, was covered in its entirety in steel mesh and concrete to act as further support for the vaulted ceiling and a supporting floor for the room itself.A problem that arose from the insertion of this concrete floor however, was the fact that it had raised the floor in this room above the rest of the house ground floor level by several inches, an issue that needed to be addressed by removing all of the concrete.