Question to the Home Office:

To ask His Majesty's Government how many people have dual British-Iranian citizenship; and of those, what estimate they have made of the number currently residing in Iran.

Under UK law, there is no restriction on holding other passports so only the ‘relevant’ nationality to a case is generally captured in a analysable form.

We cannot provide a figure on how many Iranians have rights or claims to dual British citizenship. Eligibility for British citizenship depends on an individual’s ability to meet all of the statutory requirements, and eligibility for dual nationality would also be subject to the rules of the other country involved.

In addition to foreign nationals who qualify for registration or naturalisation as a British citizen, there are a number of people who acquire dual nationality by virtue of their birth in the UK to foreign parents, or their birth overseas to British parents.