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Comparison between the EU directive and S2 routes:

https://www.nhs.uk/using-the-nhs/healthcare-abroad/going-abroad-for-treatment/compare-funding-routes/

Types of treatment requiring prior authorisation:

https://assets.nhs.uk/prod/documents/services-subject-to-prior-authorisation.pdf

Likely relevant categories:
56: "Gender identity disorder services"
58: "Highly specialist adult gynaecological surgery and urinary surgery services for women"

Application guidance notes:

https://assets.nhs.uk/prod/documents/EEA-application-guidance.pdf

Application form:

https://assets.nhs.uk/prod/documents/EEA-application-form-v11.pdf