Speaking as a Student Mental Health Nurse, the role of a MH Nurse varies hugely depending on which area you’re in: ‘mental health nurse’ is a broad term but roles are often specialised. For instance, MH Nurses can work in: Forensic Mental Health, Acute Care, CAMHS (Children & Adolescents), Substance Misuse, Low Secure, Medium Secure, High Secure, Eating Disorders Specialist Units, Personality Disorders Specialist Units, Community Mental Health Teams (CMHT), Crisis Resolution and Home Treatment Teams, the list goes on. As you can imagine, day to day responsibilities vary hugely depending on your role.
Typically, roles for mental health nurses may involve care planning, talking to patients, therapeutic approaches, clinical duties such as obs and meds, Multi-Disciplinary Team meetings, generally being at the forefront of patient care and support.
To become a psychologist or psychotherapist, honestly you’d be better off doing a more conventional route into it. For psychology, that’s usually an undergraduate Psychology degree, followed by work experience and postgraduate study (a Doctorate for Clinical Psychology.) To become a psychotherapist, you’d be best to do a degree in Psychology or Counselling & Psychotherapy or similar, then complete a postgraduate course accredited by the UKCP (UK Council for Psychotherapy) as well as the 450hrs of practice required to register with the UKCP.
Mental Health Nursing is a degree tailored specifically to becoming an NMC-registered MH Nurse, it doesn’t usually offer much of a stepping stone or advantage to applying for other career fields.
I think it’s likely that the postgrad courses saying you need a current healthcare registration are Conversion courses. Most MSc Clinical Psychology or PhD Clinical Psychology courses just require a related degree to that field, such as psychology (use UCAS Search to have a browse.)
In Nursing, you specialise when you choose your course... you either apply to Adult, Child, Learning Disabilities or Mental Health Nursing (with a small number of uni’s offering Dual-Field courses.) Once qualified, apparently Conversion courses between fields exist however they’re elusive and few-and-far-between so it’s always best to choose the field you want to work in straight off the bat when applying. Financially, placement is unpaid (in England) and the Tories scrapped our bursary back in 2017, however a new Training Grant has just been implemented towards living costs. Mental Health Nursing courses are 3 years long, covering a wide range of topics including: Anatomy & Physiology, Pharmacology, Nursing Ethics & Law (for MH that’s a lot of Mental Health Law etc), Therapeutic Approaches & Psychological Approaches, Clinical Skills, Nursing Principles & Practice etc.