The British governments longstanding antagonism towards Iran is seen throughout the history of this country since Qajar dynasty.
Iran has suffered numerous damages from the British government. One of them was the Reuter Concession which was signed in 1872. Britain knew the Persian court was short of cash, and its Baron Reuter got to sign the concessions with Nasereddin Shah Qajar. With this, Reuter would have gained control over Persian roads, telegraphs, mills, factories, extraction of resources, and other public works in exchange for a stipulated sum for 5 years and 60% of all the net revenue for 20 years. Even the imperialist Lord Curzon called the Reuter Concession: "The most complete and extraordinary surrender of the entire industrial resources of a kingdom into foreign hands that has ever been dreamed of".
The first Anglo-Soviet Occupation of neutral Iran in World War One, brought with it a famine that killed some 8-10 million of Irans 18-20 million people, between 1917 and 1919. Iran blames the famine primarily on the British army confiscating its foodstuffs.
With the second Anglo-Soviet occupation of again neutral Iran in World War Two, the British simply plucked out their earlier Persian King of choice Reza Shah, and replaced him with his son.
12 years after occupation, Iran nationalized its oil. British Prime Minister Churchill was infuriated by this. Britain did not rest and got the US to collaborate with it in overthrowing the Mosaddegh's government in 1953. Mosaddegh was the oil nationalization prime minister.
One of Britains last but not least attempts, was the successful severing and separating of Bahrain from Iran in 1970.