Ann: Share Purchase Plan Opens, page-67

I do this every chance I get and I have never been scaled back on any stock.
They have discretion to keep the money if they want and who doesn't want money?
Still its a chance typically though you can buy on market cheaper anyway so the risk of losing on this is low.

Two entities also is OK for two dips but see below.

8.2 Under these requirements, the maximum limitation applies irrespective of the number of
Shares you held on the Record Date. This limit applies irrespective of whether you hold
Shares in more than one account or capacity or are sent more than one Application Form.

Also consider your CGT discount.

Good luck.