https://www.cntw.nhs.uk/services/northern-region-gender-dysphoria-service-specialist-service-walkergate-park/information-for-professionals/
Cumbria Northumbria, Tyne and Wear. 'Northern Region Gender Dysphoria Service' website.
'We aim to create gender affirmative change with passion'
This is then 'information for professionals' page.
Links to WPATH's standards of care, version 8.
Which contains the 'Eunuch' section positing 'eunuch' as a gender identity, and including link to the Eunuch Archive.
NHS Scotland conducted an investigation after the same 'Standards of Care' were uploaded to one of its internal websites, but it seems NHS England - or at least some trusts - are still referring to them.
https://www.scotsman.com/health/investigation-launched-after-documents-published-by-scottish-nhs-in-error-stated-that-eunuch-should-be-recognised-as-formal-identity-3734369
Archived page here
https://archive.is/nS2i7