Becoming a British citizen can be difficult with the law being complex, which can lead to people being treated unfairly and having their applications rejected due to historical or admin issues. The UK government introduced a new provision to address this, as they created the Section 4L of the British Nationality Act 1981. It was introduced by the Nationality and Borders Act 2022, which provides a new route for expats to eventually become citizens in the UK.
This allows the Home Secretary to grant citizenship in special circumstances where someone would have been able to become a British citizen but for one of three reasons. These reasons are Historical Legislative Unfairness, An Act or Omission of a Public Authority and Exceptional Circumstances.
In this guide, we will explore how British Citizenship law has been made more achievable with Section 4L of the British Nationality Act 1981. Continue reading to find out more.
The Three Statutory Reasons for Section 4L
Historical Legislative Unfairness
Historical legislative unfairness is the most common reason for a Section 4L claim, created to correct past discrimination in British nationality laws. This includes situations where a person was unfairly affected by legislation that didn’t treat men and women equally when it came to passing on citizenship, or where children were treated differently based on their parents’ marital status, whether they were married or unmarried, or if the mother was married to someone other than the natural father.
This provision provides a formal pathway to rectify historical gender and marital-status-based discrimination that prevented people from acquiring or retaining British Citizenship.
An Act or Omission of a Public Authority
This section addresses situations where an individual was prevented from becoming a British citizen due to a mistake or failure on the part of a public body. A public authority is a government organization that includes government departments, a local authority, or a court.
Examples include the Home Office making an incorrect decision that prevented a person from obtaining citizenship at the time, or a local authority failing to register a child in its care who was entitled to citizenship. This provision offers a remedy for those who were disadvantaged by administrative errors from a state body.
Exceptional Circumstances
This is the most discretionary of the three reasons, as it is reserved for genuinely unique situations that are directly linked to the individual’s inability to become a British citizen. The circumstances must be so unusual that they are outside the normal scope of nationality law.
A key example cited in official guidance is a case of international parental child abduction that prevented a child from becoming a British citizen.
How Discretionary Powers are Exercised
A successful application under Section 4L truly comes down to the Home Secretary’s judgment call. With the help of immigration lawyers in London, the Home Office meticulously reviews each applicant’s story and evidence to see if it fits the rules. On top of showing they were affected by one of the three specific reasons, applicants generally need to meet a good character standard. This means they should have a clean record with no major legal issues.
If everything checks out and the application gets the green light, the person becomes a British citizen otherwise than by descent. This is a huge deal. It means they can then pass on their citizenship to any children they have who are born outside the UK, a benefit not available to those who become citizens by descent.
All in all, Section 4L is a sensible and compassionate way to fix long-standing and personal unfairness in British nationality law. It offers a vital path to citizenship for people who would otherwise have no way to gain it.
The British Citizenship Application Process
Application and Fees
You must complete Form ARD, available on the official UK government website, GOV.UK. As of late 2025, the total cost is £1,446, which includes the application fee, biometrics enrolment, and the citizenship ceremony. You may also have separate costs for the Life in the UK Test or an English language test if you need them.
Biometrics and Documents
After applying, you’ll be instructed to book a biometrics appointment at a UK Visa and Citizenship Application Services (UKVCAS) center. Here, your fingerprints and a digital photo will be taken. You must also submit all your supporting documents.
Timeline
The Home Office aims to decide on citizenship applications within six months, but this is not guaranteed. The actual processing time can be longer depending on the complexity of your case or if they need more information before they come to a conclusion.
Final Thoughts
Section 4L gives expats a more compassionate approach to fixing historical and administrative injustices within British nationality law. It’s a targeted solution for those who were prevented from becoming citizens. This provision offers a route to citizenship for those who would otherwise have been left without a solution.