Interim dividend 2007 hasn't been declared as yet but regarding dates last year's (2006) interim dividend info could be a guide.
The table below indicates that it went ex-div on 4 Sept 06 and was paid on 22 Sept 06.
Dividend:
Type CPS Franked % Ex-Dividend Date Pay Date
Final 45.00 100 06 Mar, 07 27 Mar, 07
Interim 12.50 0 04 Sep, 06 22 Sep, 06
(Sir) Lunchalot
Scoffer Extraordinaire