1949-1986

The National Archives holds duplicate certificates of British nationality from 1 January 1949 to 30 September 1986 in HO 334. To find a certificate, the registration number is required.

If you already know the registration number and wish to obtain a copy of a certificate:

1. Contact us to obtain the document reference number in HO 334
2. Use our record copying service to order a certified or uncertified copy of the certificate

If you do not know the registration number and wish to obtain a copy of a certificate:

1. Contact us in writing with the following information:
• Full name at the time of application
• Date of birth
• Town and country of birth
• Date of registration
• Place of registration
2. If we are able to locate the registration number in the name index, we will provide you with it and the related document reference number in HO 334
3. Use our record copying service to order a certified or uncertified copy of the certificate

After 1 October 1986

For all enquiries about certificates of British nationality after this date, contact:

UK Border Agency
Reliance House
20 Water Street
Liverpool, L2 8XU
email: nationalityenquiries@ukba.gsi.gov.uk

1844-1969

The National Archives holds duplicate naturalisation certificates from 1844 to 1969.

• Between 1844 and 1873, Home Office naturalisations were enrolled on the Close Rolls in C 54
• Between 1870 and 1969, duplicate naturalisation certificates can be found in HO 334

Indexes are kept at The National Archives.

After 1969

For all enquiries about naturalisation certificates after 1969, contact the UK Border Agency.