immunity from suit and legal process in respect of things done or omitted to be done by him in the course of the performance of his official duties, except in relation to a civil action arising out of an accident caused by a motor vehicle belonging to the Fund or operated on its behalf or to a traffic offence committed by him when driving such a vehicle; and

unless he is a citizen of the United Kingdom and Colonies or resident in the United Kingdom, exemption from income tax in respect of emoluments received by him as an officer or servant of the Fund or as an expert performing a mission for the Fund.