(a) significantly harm the competitive position or interfere with the negotiating position of the third party; or (b) result in similar information being no longer provided to the public body when it is in the public interest that such information continues to be so provided; or (c) result in undue financial loss or gain to any person or organisation; or (d) reveal information supplied to an arbitrator, mediator, labour officer or other person or body appointed to resolve or inquire into a labour relations dispute; or (e) reveal information that will harm the economic interests of the State. (2) The head of a public body shall not disclose to an applicant information contained in a tax return form or gathered for the purpose of determining a person’s tax liability or collecting outstanding tax. (3) Subsections (1) and (2) shall not apply where— (a) the third party consents to the disclosure; or (b) the information is contained in a record that is in the custody or control of the National Archives; or (c) the information is contained in a record that is in the archives of a public body and has been in existence for thirty or more years. 25 Protection of information relating to personal privacy (1) The head of a public body shall not disclose personal information to an applicant if the disclosure will result in the unreasonable invasion of a third party’s personal privacy. (2) In determining whether or not a disclosure of personal information constitutes an unreasonable invasion of a third party’s personal privacy, the head of a public body shall consider all the relevant circumstances, including whether— (a) the disclosure is desirable or necessary for the purpose of subjecting the activities of the government or a public body to public scrutiny; (b) the disclosure is likely to promote public health and safety or the protection of the environment; (c) the personal information is relevant to a fair determination of the applicant’s rights; (d) the disclosure will assist in researching or validating the claims, disputes or grievances of indigenous people; (e) the third party will be exposed unfairly to financial or other harm; (f) the personal information has been supplied in confidence; (g) the personal information is likely to be inaccurate or unreliable; (h) the disclosure may unfairly damage the reputation of any person referred to in the record requested by the applicant. (3) A disclosure of personal information shall be presumed to be an unreasonable invasion of a third party’s personal privacy if the personal information— (a) relates to a medical, psychiatric or psychological history, diagnosis, condition, treatment or evaluation; or 15