All registered, professional therapists are required to have a supervisor who they meet with regularly to review their work with clients. Each professional body sets its own requirements for supervision, but most therapists will be required to attend a minimum number of hours per month.
The details of each client discussed in supervision will be kept anonymous to protect the client's privacy as therapists are ethically bound to respect and ensure a client's confidentiality at all times, and the focus of supervision is on the therapist's practice to ensure they are offering the most effective and safe support to their clients as possible.
A supervisor is an advanced practitioner who has undergone further training to become qualified as a supervisor for other therapists. Supervision is a space where therapists can raise any questions or concerns they have, check that they have offered the most appropriate support for a client's situation, and seek another perspective from a more experienced therapist to make sure they have considered all aspects of a client's care.
We have more information about confidentiality here.