That is more about your big Boss protecting himself than it is about getting the news to you on the day.
Green has briefed that each individual has as much responsibility to get in touch with their notifying officer as the the officer has in tryng to get in touch with said individual. i.e. a 2 way street to make sure it happens on 1 Sep and not 3 weeks down the line.
If you want it, I hope you get it. If not, I hope you don't!
G