buy back, page-3

PeterPlus its not really that vital really,

Since this is a resumption of an existing buyback that was suspended during the RIO offer if it follows the same pattern it will be an on market buyback of the London listed shares that trade at a significant discount to the Australian shares.

So there is no dividend/franking components although I think I read somewhere that BHP is one of the biggest holders of franking credits in Australia so if they do another buyback after this one then there is the possibility of an off market buyback for Australians however I doubt they would do this while London is trading at a discount.