A clinical psychologist or clinical neuropsychologist is a therapist who can help with the impact that MS may have on cognition (thought processes, memory, concentration), thoughts, mood and behaviour.
The Health & Care Professions Council (HCPC) is the statutory regulator for health and care professions in the UK. Anyone using the job titles clinical psychologist, registered psychologist or practitioner psychologist must be registered with the HCPC.
The generic title psychologist is not protected. Some people calling themselves psychologists and offering psychological services have no recognised qualifications and are not answerable to any recognised professional body.
You can check whether a psychologist is registered using the search facility on the HCPC website.
The British Psychological Society operates a Directory of Chartered Psychologists.