Hannan joined the London Mission as High Commissioner on Sep 30 last year after his predecessor Mohamed Mijarul Quayes was transferred to Brazil amid charges of “abuse of power” and “failure to deliver”.
Acting Vice-Marshal of the Diplomatic corps Francesca Flessati came to the Chancery to take the High Commissioner in a Royal carriage for the Credential Ceremony at the Buckingham Palace.
Marshal of the Diplomatic Corps Alistair Harrison along with other senior officials of the Palace and Foreign Office welcomed the High Commissioner at the Grand Entrance of the Buckingham Palace.

Marshal of the Diplomatic Corps introduced High Commissioner and his wife to the Queen and then High Commissioner formally presented the letter of Credence and the ‘Letter of Recall’ of his predecessor to the Queen.
The High Commissioner conveyed the warm greetings of President Md. Abdul Hamid and Prime Minister Sheikh Hasina to the Queen.
During the occasion, High Commissioner introduced his officials including his deputy Khondker M Talha to the Queen.
Marshal of the Diplomatic Corps accompanied the High Commissioner and his wife during their return to the Mission in a Royal Carriage.
Later, the High Commissioner hosted a Vin d’Honneur at the High Commission which was attended by a number of British MPs, Heads of Diplomatic Missions, Senior officials of the Palace and Foreign Office Officials and members of media, think tanks, professionals, social and business leaders.
A career diplomat, Hannan has earlier served as Bangladesh Ambassador and Permanent Representative to UN Offices in Geneva and Vienna.
He also served as Ambassador concurrently accredited to Switzerland and Vatican from Geneva.
Before Geneva, he served as Ambassador at the Sultanate of Oman.