Problem is Cheater you live at the wrong end of the country!! We have been competing in this car all around the country at various times but haven't been up north for a while now. We do tend to stay in the Central Region area where the competition is probably the toughest in the country...and on top of that it is so expensive to travel these days!
To answer your question NzDatman there is an excellent Gravel hillclimb in Taihape late in June. Its 4.7km long...an awesome piece of road. I am trying to get the coming events up to date on my web page
http://www.geocities.com/cooperallysport so keep an eye on that or email me if you want to know more.