CBT is a therapy which involves talking through your problems to a counsellor. There are several types of talking therapies and they can be used to treat a number of health conditions including mental health.
Counselling - NHS Choices
Mental Health - NHS Choices
Videos from NHS Choices:
Dr Stephen Pilling, a consultant clinical psychologist, describes the different talking therapies that can help people overcome a range of problems, from depression to stress.
Phils brother Simon has a mental illness. The brothers explain how mutual support has helped them to cope with the illness.