Boarding School Survivors run weekend workshops in London for male and female adult former boarders. They can also provide you with details of therapists specially trained in boarding issues.
Boarding Recovery is a growing network of therapists who have undertaken specialist training to work with boarding issues.
The Counselling Directory can provide you with details of therapists near you.
The British Association for Counselling and Psychotherapy (BACP) maintain a list of therapists.
The UK Council for Psychotherapy (UKCP) maintain a list of therapists.
Some former boarders have found the Hoffman Process to be very helpful, particularly around the relationship with their parents