British citizenship cannot be acquired through marriage alone. Your spouse would have to live in the UK for a continuous period of three years and apply for naturalisation through the Home Office while still resident there. Once the naturalisation certificate is obtained they can then apply for a passport. It is not possible to apply for naturalisation while resident outside the United Kingdom.
If you feel our interpretation of the law is incorrect then you can seek legal advice. Copies of the British Nationality Acts can be ordered from Her Majesty's Stationery Office or from a book shop that specialises in legal documents. The legislation currently in force is the British Nationality Act 1981.
We need to confirm your place/town of birth and your parent's details (if you were included in a parent's passport, for nationality purposes and in case you were the child of diplomatic parent). This information is not shown on the short-form birth certificate.
From the General Register Office whose address is PO Box 2, Southport, Merseyside PR8 2JD for postal applications. You can apply in person at St Catherine's House, 10 Kingsway, London WC2B 6JP and collect certificates on the fourth working day following your visit or have certificates posted to any address supplied. A priority service is available by phoning 0151 471 4524 or faxing 0151 471 4368 (UK codes – from USA dial 011 44 151 471 4524/4368). You will need to have a credit/debit card for this service.