The following information should be on your student finance account for your 2012-2013 application when you log in:-
You will receive your first payment(s) within 3 to 4 working days of your attendance being confirmed to us by your university or college.
All other payments should also be paid into your account within 3 to 4 working days of the expected payment date.
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You also need to have sent them your signed decleration in order for them to pay you on time. If you haven't done so already you should do this ASAP as it will likely take them a few weeks to finalise your application, since they will probably be dealing with applications which have been submitted late, and also with applications from EU students. The best thing to do in this case is to send your signed decleration via recorded delivery as you can be assured that they received it, and it has been accounted for, as it will require a signature. I done this with my mum's PFF2 form as I sent it off on the 29th June, which was the deadline day, but they got it on the 2nd July, and my account had been changed to say that they were now waiting on my signed decleration, which I'm gonna send off soon via recorded delivery. I don't know whether you will get paid at the start of September or the middle of it, as they don't usually pay you your loan until a few days before your expected payment date (that's what they do with me). I go back to uni on the 01/10/2012, but my first payment date is the 07/10/2012. In the past 2 years, my first payments for each year has always been either on the same day I start uni or a few days before, never after until this year, but it's only a week for me so I can survive. However, I doubt you will paid your loan in early or mid September, as I've never heard of anyone being paid a few weeks in advance.