12. Except in so far as in any particular case any privilege or immunity is waived by the Secretary of the Organisation or, in the case of the Secretary, by the Organisation, all officers of the Organisation employed full time by the Organisation and subject to its staff regulations, with the exception of persons in the domestic service of the Organisation and persons recruited locally and assigned to hourly rates of pay, shall enjoy:
(a)immunity from suit and legal process in respect of acts done by them in the exercise of their functions, including words written or spoken, except in the case of a motor traffic offence committed by an officer or in the case of damage caused by a motor vehicle belonging to or driven by him;
(b)as from the date on which the salaries and emoluments received by them as officers of the Organisation become subject to taxation by the Organisation for its benefit, exemption from income tax in respect of such salaries and emoluments, provided that nothing in this paragraph shall be interpreted as precluding such salaries and emoluments from being taken into account for the purpose of assessing the amount of taxation to be applied to income from other sources;
(c)unless they are British citizens, British Dependent Territories citizens or British Overseas citizens or are permanently resident in the United Kingdom, the like exemption from duties and taxes on the importation of furniture and personal effects (including one motor car each) which—
(i)at the time when they first enter the United Kingdom to take up their post, are imported for their personal use or for their establishment, and
(ii)were in their ownership or possession or which they were under contract to purchase immediately before they so entered the United Kingdom,
as in accordance with paragraph 1 of Article 36 of the 1961 Convention Articles is accorded to a diplomatic agent; and
(d)provided that the Organisation has established or joined a social security scheme, exemptions whereby for the purposes of the enactments relating to social security including enactments in force in Northern Ireland—
(i)services rendered for the Organisation by them shall be deemed to be excepted from any class of employment in respect of which contributions or premiums under those enactments are payable, but
(ii)no person shall be rendered liable to pay any contribution or premium which he would not be required to pay if those services were not deemed to be so excepted.