"We saw one example where a finance company's deposits grew from $800,000 to $8.3 million after its deposits were guaranteed." Treasury "did not see itself as able to interact with a finance company to attempt to moderate that behaviour, even when it could see the Crown's potential liability increasing markedly".
Cunliffe said that having underwritten deposits, active intervention, management and rigorous oversight was required from Treasury to protect taxpayers' interests.
"What the report makes clear is that those systems were not in place. ... why did ministers not require that? Why were ministers not asking questions given that hundreds of millions of dollars were at stake?"
But Treasury Secretary Gabriel Makhlouf said more intervention would not have necessarily reduced the fiscal risks inherent in the scheme.
"All interventions carry a degree of risk and we don't believe that the Auditor-General's report gives sufficient weight to the risks that further interventions would have created."
A spokesman for English said the Finance Minister had no comment on the issue of Treasury's management of the scheme's risk.