@Lifeaintalwaysempty
Surely if it’s a field that is filled in on some people’s passport applications, it’s in a database somewhere, so someone can collate by running the right sort of query?
I have zero knowledge of these things so might be fantastically naive!
That’s the problem- there isn’t a field to record this reason for an update:
You have a valid British passport in your birth gender but wish to apply
for a new one in an acquired gender.
Please follow the guidance on how to make changes to your existing passport in the “Applying for a passport” booklet.
You should select the “Changes to your existing passport – New Name” option under section 1, as we do not record gender change as a specific category on our application form.
Under section 2, you should complete the details relating to your acquired gender, but you will also need to include previous names used in your birth gender.
In addition to your old passport, you will need to include one of the following as part of your application:
• a birth or adoption certificate in your acquired gender
• a Gender Recognition Certificate
• a letter from your doctor or medical consultant confirming that your change of gender is likely to be permanent, and evidence of your change of name such as a deed poll.”
From
”Applying for a passport
Additional information for transgender and transsexual customers”
assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/251703/Applying_for_a_passport_additional_information.PDF