Does anyone on the course know if there are any additional costs?
Yes, I do. And no, there aren't. I'm on the course as we speak, reaching the end of the NZ phase.
You don't pay any VAT on the £69,000 because it is a 'bond' and not a 'fee'. The cost of the foundation course is including VAT - no hidden extras there, but it will vary by a few hundred pounds every time the £/$ exchange rate wobbles as the foundation phase is paid for in NZ dollars. Make sure you consider this when budgeting for NZ - it's really not cheap to live out here at the moment!