Acording to FreeBMD Death Certificates
may contain
some or all of the following:
District, Location, Date & Place of Death,
Forename & Surname, Sex, Maiden Name,
Date & Place of Birth, Occupation, Usual Address,
Informant's Forename & Surname,
Informant's Qualification, Informant's Address,
Cause of Death, Signature of Informant,
Registration Date, Registrar's Signature.
However the GRO web site says
The details contained on a death certificate include:
Name, date and place of death.
Date and place of birth (before 1969 a certificate only showed age of deceased).
Occupation and usual address.
Cause of death.
The person who gave information for the death registration.
The GRO's guide to death certificates says that the name on the certificate will be the name by which the person was known at the time of death, not the name they were given at birth.
So I think it is unlikely that Ann's death certificate will tell you the name of her father, and certainly not that of her mother.
I believe that you are allowed to ring or e-mail a local registrar and ask a question to which the answer will be yes or no. In this case you could contact the Gloucestershire Archives at Gloucestershire Archives, Clarence Row, Alvin Street, Gloucester GL1 3DW, telephone 01242 532455, fax 01242 254600 or e-mail
cheltenham.ro@gloucestershire.gov.uk and ask them whether her name, or the name of the informant, on Ann's death certificate contains any information that might enable you to find out her maiden surname*. If the answer is yes, you can then order a copy of the certificate. Note that the local registrars do not use the same index as the GRO/FreeBMD. You can find out the reference used by the Gloucestershire registrars at
http://ww3.gloucestershire.gov.uk/bmd/DeathSearch.aspx*Don't just ask if it lists her maiden name. If you do, they will look at her name and probably reply no. If, however, the informant was, say, a niece or nephew, you may be able to use that to work out what her maiden surname was.