Anne, please pm me, and if you can, scan me your tapu. I know the property and development manager at the council office, and I have recently met the Tapu office manager.
I will without cost to you, take your tapu to him, and hopefully answer your questions with a true and lawful answer!
I have, at least (!) 7 years experience in purchasing property, and everything that that entails! Be it; tapu application and collection, living permission, property purchase tax, property tax etc. I also have 7 years of knowledge about property with regards to the council!
I hope that that will be a help to you...