Prior Wilbert was responsible for many changes to the late Norman Cathedral. The Prior was the head of the monastery and the Catherdral. Wilbert built the Infirmary chapel and the treasury. Last but not least, he arranged that the Cathedral and monastery should have a clean water supply, by piping water in lead pipes into the Cathedral. Some of this piping survives in a functional form today.
The round tower in the photo contained a great brass basin weighing 500lbs with a fountain at its centre. As the monks walked at midnight from their dormitory, they could wash their hands and faces on the way.