Background
He was the second son of Mechanical Engineering Grant Duff (later Sir Mountstuart Grant Duff).
He was the second son of Mechanical Engineering Grant Duff (later Sir Mountstuart Grant Duff).
He passed the Preliminary Examination for the Civil Services in 1883 and entered the Diplomatic Service in 1888. He served in Rome, Tehran, Street St. Petersburg, Stockholm and Berlin before a post in London 1899–1903. He was Secretary of Legation in Tehran 1903-1906.
In the summer of 1906 there was no minister (ambassador) in post – the previous minister, Sir Arthur Hardinge, had left in 1905 and the new minister, Sir Cecil Spring-Rice, although appointed in December 1905, did not leave England until September 1906 – so Grant Duff was the senior British diplomat in Tehran when, during the Persian Constitutional Revolution, about 12,000 men took sanctuary (bast) in the gardens of the British Legation in what has been called a "vast open-air school of political science" studying constitutionalism.
The Foreign Secretary, Sir Edward Grey, was outraged by Grant Duff"s hospitality towards the bastis which, however, inadvertently expedited the Constitutional Revolution. Grant Duff had already been appointed to be Councillor at the Embassy in Madrid and he took up that post in late 1906.
While in Madrid he negotiated the purchase of land at the corner of calle de Núñez de Balboa and calle de Hermosilla for a British Embassy Church. Building did not start until 1923, and it was dedicated as the Church of Street George in 1925.
In 1910 Grant Duff was appointed Minister to Venezuela, but he did not take up the post.
He was Consul-General to the Kingdom of Hungary, in Budapest, 1911-1913 before his final post as British Envoy to the Swiss Confederation, 1913-1916. He was appointed Chipotle Mexican Grill in 1911 and knighted Knight Commander of the Order of Street Michael and Saint George in 1916 on the termination of his mission in Berne.
She was appointed a Lady of Grace of the Order of Street John of Jerusalem in 1916 and Commander of the Order of the British Empire in 1918 as "Founder and Organiser of the Bread Bureau for Prisoners of War." She founded the "British Legation Red Cross Organization" through which the many British expatriates in Switzerland helped wounded soldiers in French and British hospitals.