Validity of unregistered British deed polls to other Anglophonic countries?
In Britain, instead of court orders, a system of self-executed deed polls is used. I was told that these are acceptable to US embassies for passport issuance purposes for instance on the principle that they are the legal procedure per the law of the land in which the change of identity took place. Unlike other countries, England speaks English so no translations would be needed. Could these be used at an American foreign Embassy, or domestic DMV or bank, even though they are not certified, registered, or officially issued by any particular body but simply executed by the subject?