You will need to anonymise the author of a sensitive document that should not be identified as linked to a particular organisation.
…at NHS Trust A (2017) the procedures for discharge are clearly drawn up.....
ANONYMISED TRUST/AUTHOR, Year of publication. Title of document. City or County where published (leave out if this could identify source): Anonymised Trust/Organisation [unpublished]
NHS TRUST A, 2017. Guidelines for discharge from hospital. Hampshire: NHS Trust A [unpublished]
NHS TRUST A, 2017. Guidelines for discharge from hospital. NHS Trust A [unpublished]