Hi Mark,
The open university course is a good enough course to get you registered with BPS (British Psychological Society).
What you do from there is another matter. as odd as this might seem doing a psychology degree wont qualify you to help people.
counselling, CBT, psychotherapy or mental health nursing are much better routes of study if you are wanting to help people.
If you want to be employed then psychology is the most difficult route to go mental health nursing has the most job vacancies and career development opportunities.
Counselling, psychotherapy, hypnotherapy and CBT are good otpions if you want to work for yourself.
it is not an easy field to make a living but it is a very rewarding field if you are interested in people and care about the welfare of others.