I'm kind of disappointed that it took me a week to notice this but apprently Terry's mystery lender of $4m was fellow Wellington property developer Mark Dunajtschik. I'm not 100% sure because I don't have an NBR subscription but his name showed up in the tags when the link was posted on another website.
Can somebody with a subscription please check: Source of Serepisos' mystery money revealed
If it's true I'm intrigued that the money comes from a "white knight" so close to home, and from someone within the property industry who's obviously prepared to show some faith in Terry.