Err, I'm not sure that's entirely accurate You need to be on the...

Err, I'm not sure that's entirely accurate

You need to be on the register as at the Record Date - see here:
http://www.investopedia.com/articles/02/110802.asp

Date of Record: This is the date on which the company looks at its records to see who the shareholders of the company are. An investor must be listed as a holder of record to ensure the right of a dividend payout.

The Ex-Date is the date at which you can buy on market and get onto the register in time for the record date (Trade Date - 2). Definition below

Ex-date or Ex-dividend date - On (or after) this date the security trades without its dividend. If you buy a dividend paying stock one day before the ex-dividend you will still get the dividend, but if you buy on the ex-dividend date, you won't get the dividend. Conversely, if you want to sell a stock and still receive a dividend that has been declared you need to sell on (or after) the ex-dividend day. The ex-date is the second business day before the date of record.

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With that knowledge, so long as you're on the register on or before the Record Date, you will get the dividend.

Reviewing the facts:
Record date - Tuesday, September 1, 2015
SPP Allotment Date - Monday, August 31, 2015

From my point of view, I believe those who participated in the SPP will get the dividend.

Happy to be shown where I've gone wrong in the above.
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