No worries Graham. That is a nice ride you have there !!
NZCSX2323
Have you contacted the MG Car Cub? They have a lot of organised day trips in and around ChCh as well as a few track days out at Ruapuna. They don't mind what you drive and I'm sure they'd love to have you come along. I've done a few of their events in my Civic. If you do, find my folks (red 69 MGB-GT) and say hello
Another good day trip would be a run up to Hanmer.