http://www.legislation.gov.uk/id/uksi/1961/2051

SCHEDULE

Register	Certifying Officer	Mode of Authentication
Register of Births	The Registrar-General of Births and Deaths, an Assistant Registrar-General of Births and Deaths or a district registrar.	The signature of the certifying officer.
Marriage Register Book.	A Registrar of Marriages, a Deputy Registrar of Marriages, or an Assistant Registrar of Marriages.	The signature of the certifying officer.
Register of Deaths	The Registrar-General of Births and Deaths, an Assistant Registrar-General of Births and Deaths or a district registrar.	The signature of the certifying officer.