Thanks for the quick responses, and the offer of further advice. I'm sure after talking with Mrs T we will have some more questions. We're looking to keep to a reasonable budget and will probably use AirBnb and Homestay .com for accommodation as we travel around unless there are other local alternatives?!
For those interested, we are on Reward tickets courtesy of KLM and SkyTeam. Round trip at present booked, London, Amsterdam, Singapore,Christchurch, Sydney and back to London. Business Class all the way, around 500,000 miles and total taxes around £850 Sterling total.