Ties between Iran and the UK are now fully restored thanks to the appointment by both countries of ambassadors following a strain in diplomatic relations for five years.
This follows the successful negotiation of a nuclear deal and the lifting of the economic sanctions that the west placed upon Iran.
Despite the two ambassadors Nicolas Hopton from the UK in Tehran and Hamid Baeidinejad for Iran in London now in place, the leadership of Iran continues to mistrust the UK.
In June of 2015, the Ayatollah Ali Khamenei who is the Supreme Leader of Iran warned during a speech of a big mistake in trusting evil Britain and the U.S., which is called the Great Satan.
Relations between the UK and Iran have been up and down for decades.
During the Shah Reza Pahlavi reign, Britain was feared as well as hated amongst a number of Iranians for the opposition to the oil nationalization under Mohammad Mossadeq, whose 1953 downfall was partially due to American and British intelligence.
The British embassy was closed in Iran after the Islamic revolution that ended the reign of the Shah and brought to power Ayatollah Ruhollah Khomeini.
Ties between the two were not restored until the late 1980s when Britain reopened its embassy in Tehran.
Nevertheless, the restoration of ties lasted only months, as in February of 1989 Khomeini issued his fatwa or religious decree that urged Muslims to kill Salman Rushdie a novelist for writing The Satanic Verses.
That resulted in a breakdown of ties since riots in Britain against publishers and novel killed people. Later during 1989, Khomeini died but the fatwa remained.
In 1991 another thaw in relations took place when a British hostage, Terry Waite was released after being held more than five years by the Hezbollah a Lebanese militia supported by Iran.
However, Tehran later the next year expelled a British diplomat with Britain responding in kind.
Not until 1998 were ties restored, when the fatwa was ended against Rushdie.
Ties have been made and cut off and on since then. Not until June of 2014 did Britain say it could reopen its Iranian embassy after relations improved with the election of President Hassan Rouhani a moderate who wanted the ties restored.
Then after Iran and six world powers came to an agreement during July of 2015, Britain reopened its Tehran embassy the next month.