It hasn't yet reached Thames but it is in the Waikato. There have been over 100 cases in Auckland and at least 5 have needed hospital admission.
If your child hasn't had the MMR vaccine please reconsider it now. The complication rate from measles (including death and brain damage and blindness) is MUCH MUCH higher than the very rare rate of serious side effects of the vaccine. You would never forgive yourself if your child was one of those who got the serious measles complications.
The link between MMR and autism has been DISPROVEN many times and the man who first made the allegation has admitted to falsifying the information to make money. (google Andrew Wakefield)