concordnz: I still think all the 'existing' Shares/dividends, will likely still be allocated to the original (single) IRD number,
and only 'new shares' purchased after the date of providing the 2nd IRD number, are likely to be split 50/50.
You could well be right - that had crossed my mind too.
Accordingly I have just emailed them saying: “Could you please confirm that, now that we have two holders’ IRD numbers recorded at Computershare, you will forward split dividend income information to IR.”