To apply, you should speak to your Academic Advisor or Supervisor who can initiate the process. There is a form to complete along with providing the relevant evidence of your circumstances. This request will need to be reviewed by your Academic Adviser and Supervisor as well as the Departmental Tutor/Programme Director. These requests are usually only granted in exceptional circumstances.
Access interruption form
MPhil and PhD students should contact the PhD Academy for guidance on Interruption.
The full guidance can be found here.