On arrival, your manager should explain about HMPPS and the department in which you are working. They should also:
You will have a probation period at the start of your job, with your manager confirming if you pass your probation period. Probation policy differs between probation, prisons and HQ. When you start your new role, make sure to complete your personal information on MyHub - ask your manager for your employee number and login details.
As a member of staff you are required to protect and exercise care in the use of information acquired during the course of your work. Staff are bound by the provisions of the Official Secrets Act.