The bulk of the NZ finance company collapses had very little to do with the GFC. Many were simply poorly managed companies and/or Ponzi schemes that ultimately reached the point where they self imploded.
I recall those days well....the herald would have tons of advertisements where finance companies would offer double digit interest rates , and people flocked to them.
Despite almost every other week the herald would also have an article about the very high risks of these companies... even the finance journalists probably never thought it would turn out as badly as it did. Very few survived. UDC is still around, but I think they were owned by ANZ.