This is a fag packet list of standards used across the NHS.
Some are in effect standards, especially Patient Administration / HL7v2 ADT and Orders + Observation’s (outside of primary care).
Events should (/must?) agnostic to transport (so work on MESH, Http, FTP, etc)
They are small on purpose.
The suggestion is like HL7v2 and also the USofA HL7.FHIR.US.DAVINCI-ALERTS\Home - FHIR v4.0.1 (this is a business focused description of the events)
This assumes pure FHIR RESTful wouldn’t be practical (however some events would be small enough to be RESTful like the POST /DocumentReference used in NRL). Having a mix of both interaction is a practical option?