Under U.S. law, Americans who choose to renounce their citizenship must do so at an overseas consular office.
The Foreign and Commonwealth Office has been providing consular assistance since Mr Emmett's arrest and has confirmed that it is continuing to offer help to him and his family.
The court has also heard claims that former Prime Minister Tony Blair's office frustrated attempts by consular officials to help a detainee who was facing transfer to Guantanamo, the US detention facility in Cuba.
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The Foreign Office said it was providing consular assistance to Mr Mockford's family.
The Foreign Office said it was providing consular assistance to his family.
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The British Foreign Office said that it provided consular assistance to a British national arrested in Kenya in 2010, but declined to provide further details.
The Foreign Office said it was offering consular assistance.
The Foreign Office confirmed it had been providing consular assistance and liaising with local authorities since the shooting on 11 January.
The Foreign and Commonwealth Office said it was continuing to provide consular assistance to the family.
The Foreign and Commonwealth Office said it is continuing to provide consular assistance to Mr Ahsan and his family.
The UK's Foreign and Commonwealth Office confirmed it had been providing "consular assistance" to the three men, and had "been in close contact with Reprieve".
As for those non British nationals, who were resident in the UK before their detention, the Foreign Office said the government was "not in a position to provide consular or diplomatic assistance".
The Foreign Office said it had been informed of Mr Lynch's death and was "providing consular assistance".
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The Foreign and Commonwealth Office said it "strongly objected" to the death penalty and was continuing to "provide consular assistance to Lindsay and her family during this difficult time".
The Foreign Office said it was aware of the death of a British national in Thailand, and was providing consular assistance to the family.
The UK Foreign Office said it was aware of the arrest of a British national in Massachusetts in July 2012 and consular assistance had been offered.
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