Mount Grace Priory, Yorks.

English Heritage
In a grassy space are substantial ruins of the small priory church, and of the four-room cells inhabited by the monks. One of the cells has been restored and furnished to show how the monks lived. Each Carthusian monk mostly lived alone in his cell, to which meals were brought. Each cell had its own garden, and its own running water and primitive toilet.
An interesting site, worth a visit if you are in the area.