A UK Certificate of Naturalisation or Registration is official proof of British citizenship. When dealing with foreign authorities, whether for immigration, dual nationality, marriage, or residency, you may be required to complete apostille or full legalisation.

Ensuring the document is correctly prepared before submission is essential to avoid delays or rejection.

Can a Naturalisation Certificate be apostilled?

Yes. The UK Foreign, Commonwealth & Development Office (FCDO) accepts the following for apostille:

• The original Certificate of Naturalisation or Registration signed and sealed by a Home Office official

• The original Certificate of Naturalisation or Registration not signed and sealed by a Home Office official

• A photocopy or printed copy of the Certificate of Naturalisation or Registration

However, certification requirements depend on the document format.

Important certification requirements

If the original certificate does not contain a wet-ink signature from a Home Office official or an embossed seal, it must first be certified by a UK solicitor or Notary Public before it can be submitted for apostille.

Likewise, if you are submitting a photocopy or printout, it must always be certified by a solicitor or Notary Public prior to legalisation. Uncertified copies will not be accepted for apostille.

Proper certification confirms the document is a true copy of the original and allows the apostille process to proceed.

Why is legalisation required?

Foreign authorities may request apostille or legalisation of your Certificate of Naturalisation or Registration for several reasons, including:

• Applying for residency in another country

• Registering dual citizenship

• Sponsoring dependant visa applications

• Getting married abroad

• Updating immigration or civil records overseas

The apostille verifies that the UK-issued document is authentic, enabling it to be recognised internationally.

Apostille or full legalisation: what’s the difference?

The type of legalisation required depends on the country where the document will be used.

If the country is a member of the Hague Convention

Only an apostille is required. The apostille certificate alone confirms the document’s validity.

If the country is not a Hague member

You will need:

• An apostille from the FCDO

• Further embassy or consular legalisation

This additional step is often referred to as embassy attestation.

Should you legalise the original certificate?

Because a Certificate of Naturalisation or Registration is an important identity document and replacements can be time-consuming and costly, many people choose to legalise a certified copy rather than the original.

Having a solicitor or Notary Public certify a copy before apostille provides an added layer of protection while still meeting legalisation requirements.

Key points to remember

• Apostille and legalisation refer to the same UK authentication process

• Originals without a wet-ink signature or embossed seal must be certified first

• Photocopies must always be certified before apostille

• Non-Hague countries require additional embassy legalisation

• Legalising a certified copy is often the safer option

Taking the correct steps from the outset will help ensure your Naturalisation Certificate is accepted overseas without unnecessary delays.