Section 60 clarifies that the defence in section 9 (protection from liability) is not applicable where a person already has authority to do an act that falls within its scope. This could be because the person has been given the power to do the act under another statute or under a lasting power of attorney. The person could also have been appointed as a deputy by the Court under Part 6 and given the power or duty to make the relevant decision on behalf of P. Section 60 also recognises that persons aged 16 or 17 are still children under the law even though they fall within the scope of Part 2 and, therefore, a parent or guardian may also have legal authority to act on behalf of such persons.