In reply to Rich2002:
Christchurch is probably the best base, there isn't really a closer place that has a climbing scene to meet partners. Public transport is non existent. There isn't really a good active climbing forum in NZ currently, the existing one isn't used much, but there is a good Facebook page called Where are you climbing tonight Christchurch, which is the best bet for getting lifts and partners.
You can drop me a line, I don't Boulder hard and haven't been there too many times, but it's my intention to get out there more often.
Flock hill has less polish, but more of a walk in and there is an email address that you have to use to say you are going there, but this might all change as it has new American owners who already appear a bit anti outdoor use!
The first time you go to CH, expect to get completely lost and some classic problems are very polished.