Last week, the Office of the Auditor-general launched an inquiry into land purchases by DCC infrastructure company Delta Utility Services.

Delta bought part of a subdivision in Luggate in 2008, and another at Jacks Point, near Queenstown, in 2009.

But the value of the land has subsequently been written down by millions of dollars.

That contributed to the Dunedin City Holdings Ltd group of companies' showing a $5 million loss for the year to June.

Dunedin Cr Lee Vandervis has been vocal about the issue, and he joins us tonight.