Which of the following is NOT one of the AAT code of conduct principles?

The principle of transparency is not included in the AAT code of conduct. The AAT code outlines key principles that professional members must adhere to in their practice, which include integrity, objectivity, and confidentiality.

Integrity emphasizes the importance of being honest and straightforward in professional and business relationships. Objectivity emphasizes that members should not allow bias, conflict of interest, or undue influence of others to override their professional judgments. Confidentiality requires members to respect the privacy of information acquired during the course of their work and not disclose it without lawful or professional reasons.

While transparency is an important concept in many professional settings, it is not specifically one of the core principles outlined by the AAT code of conduct, making it the correct choice in this question.