Abstract: The file contains correspondence regarding invitations from Iran, Ministry of Health to send representation to the 25th anniversary celebration of the opening of the Persian Pasteur Institute in Tehran. The majority of the file contains correspondence regarding the decision to send a Doctor Pirdie and Colonel Findlay as representatives of the UK, and includes discussions of travel arrangements and dress code. The main correspondents are as follows Sir John Helier Le Rougetel (HM Ambassador to Iran); the British Embassy, Cairo and the Government of India, External Affairs Department. The file also includes a telegram addressed to the Foreign Office from Le Routegel relaying information received from the French Embassy and the physician of the British Embassy in Iran, Tehran. The telegram suggests that plans to celebrate the 25th anniversary of the opening of the Persian Pasteur Institute have been organised in order to jeopardise an inspection planned by the French Pasteur Institute and to prevent their plans to replace the current Persian head. The United States of America’s planned representation is discussed and concern over potential Russian involvement in the event of the United Kingdom’s failure to send a representative is also expressed.Physical description: Foliation: the foliation sequence (used for referencing) commences at the front cover with 1, and terminates at the inside back cover with 7; these numbers are written in pencil, are circled, and are located in the top right corner of the recto side of each folio.