Require models for a photoshoot

We are looking for a location for a short film that we are shooting - any suggestions or help would be wholly appreciated.
The location we need would resemble an old prison cell. The film is set in a roughly 19th-century asylum so, a basement, vaults, a dungeon, an old prison cell would do the trick.
Ideally in or around London for two shooting days, for a cast and crew of about 10 people, mid-January or later.
Here you can see the video of the original location that we unfortunately lost to flood damage.
We require the location in or around London for two shooting days, for a cast and crew of about 10 people from mid-January or later.
For more information about the film, see here: greenlit.com/project/final-chapter-madness Play Video