Well... I received a reply (surprised as I thought I'd hear nothing or tomorrow)
It's quite rude IMO but here it is:
To me the statement is clear.
Sending of emails will commence after midnight on Friday night.
Had I not put / Saturday then I would have had people emailing asking does that mean emails will be sent in the early hours of Friday morning!!!!
So, just so that there is no misunderstanding no emails will be sent on Friday at all.
Sending of emails will commence some time after 00:01 on Saturday 15th October 2011.
What exact time? - unknown.
When will yours be sent? - unknown.
How long will it take to send all emails? - unknown.
We are all at the mercy of our ISPs - see today's news regarding Blackberry.
That is why we will not be any more specific than the statement that has already been published.
I've asked if it is more accurate that emails will begin to be sent on Saturday am when staff get to the schools.
If he replies I'll let you all know.