beargrass I can’t show enough of the document to enable verification because that would identify the very small Dept and the NHS Trust involved, so would either instantly out me and/or potentially subject colleagues to harassment.
It is a pure fluke that I have a copy of the electronic file from 2007. This is due to a member of Admin staff emailing it to me at my NHS.net address at the time, asking if the "Sample" form (as shown in image attached) should be released as a Final document. I downloaded the form at home to proof-read it and forgot to delete the file.
However, I am very glad you asked because my memory was playing tricks with me - it was over 13 years ago, after all 
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The change I was required to make by Medical Records in 2007 was to replace "Sex" with "Gender". Medical Records said that they had received a Directive that the "Sex" Field in NHS Electronic Records must be replaced by "Gender" and that patients must be asked every time they were seen whether they had "changed gender" in order to update medical records if necessary.
The rationale I was given, when I dissented, was that it was important to have the correct gender recorded if the patient should be admitted as an In-Patient. That made no sense as, according to Medical Records, the patient would anyway be asked at the point of admission whether they had "changed gender".
This all occurred two years before the Dept of Health Directive to the NHS as a whole. The implication from Medical Records was that they had received a Directive in 2007. Possibly this related only to Mental Health Trusts? Perhaps it came from somewhere other than the Dept of Health? In any event, I did not get the impression that this was a decision at Trust level but rather that it had "come down" from somewhere else.
UppityPuppity The EA2010 should have over-ridden the 2009 Dept of Health Directive. The whole point of the Mumsnet thread that I linked to is to demonstrate that it did not do this. Despite EA2010 the NHS continued with the fiction that single-sex actually meant single-sex, not single-gender, and Self-ID continued to be enshrined in Dept of Health and NHS policy, ie in breach of EA2010.
www.mumsnet.com/Talk/womens_rights/3396859-Weve-been-lied-to-about-Single-SEX-wards-since-2010
Just because something is against the law does not stop people doing it. This is yet another example of Policy Capture within Whitehall determining local statutory services, just like the MoD and Criminal Justice System adopted Self-ID in breach of EA2010. There is a despicable history of statutory services deciding that anyone who "self-declares" should enjoy the rights that legally should only have been accorded to those holding a GRC and of ignoring the exemptions that applied to those holding a GRC.
Until the recent boom in young girls deciding that they are really men, these policies almost exclusively privileged males at the expense of the dignity, privacy and safety of women.
I have to wonder if the NHS would have been so keen to assign In-Patients to wards based on self-declared gender if the impact of this policy would have resulted primarily in teenage girls and young women being placed on Men's Wards? If that had been the case, surely there would have been pause for thought about the wisdom of covertly implementing a "single gender" policy?