There are definitely elements in HQAC (and wider) who believe that uploading something to sharepoint instantly and automatically brings that thing into effect, somehow expecting people to notice this and adapt immediately.
Obviously this is an insane concept but we have all seen it happen. The art of promulgating changes seems to have been lost somewhere and needs to be found again.
The sensible route (I believe) would be for updates and amendments to be prepared on MOSS in draft form, along with the announcement documents and change lists. To roll this out as a "live" document, upload it all to Bader sharepoint and promulgate the changes by email and in other places.
To manage the workload for units, have quarterly roll-outs for changes (except any genuinely urgent ones) and issue a combined amendment list WITH DETAILS OF WHAT HAS CHANGED to all units, directly and via an announcement on SP.