What is double descent?

Double descent describes a child born outside the UK to a parent who is themselves a British citizen by descent. The child has no automatic claim to British citizenship. The child may be able to register under section 3(2) or 3(5) of the British Nationality Act 1981, or at the Home Secretary's discretion under section 3(1).

How double descent works

British citizenship by descent passes to one generation born abroad. A child born outside the UK to a parent who is British otherwise than by descent is British automatically, and is British by descent.^{[1]Home Office, Form MN1: guidance (accessible version)} The next generation does not follow automatically.

This page uses double descent for the situation where a child is born abroad to a parent who is themselves British by descent. The MN1 guide says such children have no automatic claim to British citizenship.^{[1]Home Office, Form MN1: guidance (accessible version)} The Home Office guidance on automatic acquisition says the same: a British citizen by descent cannot normally pass citizenship to a child born outside the UK.^{[3]Home Office, Automatic acquisition of British citizenship: caseworker guidance (accessible)} See British citizen by descent for the difference between the two kinds of citizenship.

There is an exception. A child born abroad to a parent who is in Crown service or a designated service is British otherwise than by descent. The parent must have been recruited in the UK and sent to serve abroad.^{[1]Home Office, Form MN1: guidance (accessible version)}

A child in this position still has routes to apply. The MN1 guide says applications may be made through an entitlement under section 3(2) or section 3(5) if the child meets the requirements. Another route is the Home Secretary’s discretion under section 3(1), where there are compelling or exceptional reasons.^{[1]Home Office, Form MN1: guidance (accessible version)}

The registration routes

The conditions in the table come from section 3 of the Act and the MN1 guide.^{[2]legislation.gov.uk, British Nationality Act 1981, section 3: Acquisition by registration: minors} The guide adds that, for section 3(2), the 3 year period can be spent in a qualifying British overseas territory if the child was born on or after 21 May 2002. The 3 years of residence for the parent do not apply if the child is stateless.^{[1]Home Office, Form MN1: guidance (accessible version)}

For section 3(5), the child and the parents must be physically present in the UK at the start of the 3 year period. The guide says there is no discretion to disregard absences over 270 days. If the parents’ marriage or civil partnership has ended or they are legally separated, only the child and one parent need to meet the residence test.^{[1]Home Office, Form MN1: guidance (accessible version)}

The MN1 guide says that families abroad may need to choose. It tells them to decide whether to apply under section 3(2), or whether to wait and apply under section 3(5) if the family may return to the UK before the child reaches 15.^{[1]Home Office, Form MN1: guidance (accessible version)} For a child born on or after 1 July 2006, GOV.UK shows a fee of £1,000.^{[4]GOV.UK, Apply for citizenship if you have a British parent: you were born on or after 1 July 2006}

Example

Claire was born in France in 1970. Her father was born in the UK in 1949 and she is British by descent. She lived in the UK from September 1989 to September 1992 and was never away for more than 270 days in that time.

Claire’s son Leo was born in France in 2009. Leo is not British automatically. Because of Claire’s UK residence, he can be registered under section 3(2) while he is under 18. This is the example the MN1 guide gives.^{[1]Home Office, Form MN1: guidance (accessible version)} If he is registered this way he is British by descent. If he later has a child abroad, that child is again not automatically British.^{[1]Home Office, Form MN1: guidance (accessible version)}

What people get wrong

Many families assume that a British parent or grandparent is enough to make a child British. For a child born abroad to a parent who is British by descent, it is not. There is no automatic claim.

The Home Office guidance says so directly.^{[1]Home Office, Form MN1: guidance (accessible version)} The second mistake is about timing. Section 3 applications must be made while the child is a minor.^{[2]legislation.gov.uk, British Nationality Act 1981, section 3: Acquisition by registration: minors} Once a person reaches 18 they must apply as adults, either by registration if they have an entitlement or by naturalisation.^{[1]Home Office, Form MN1: guidance (accessible version)} The naturalisation vs registration page explains the difference.

The bottom line

Double descent describes a child born abroad to a parent who is British by descent. The child has no automatic claim to British citizenship. The child may be able to register under section 3(2), section 3(5) or at the Home Secretary’s discretion, and the route decides whether citizenship can then be passed on. The child must apply before turning 18. See British citizenship by registration for how Compass can help.