Hi Mark - great discussion!
Interesting view about the UK system as my cousin and her partner have been given the OK to immigrate there - whether they will can save and bring back more $ in 5 years time is to be told.
I do think that bringing in capital gains tax in NZ can not be political suicide. The NZ gov't can slowly implement a form of capital gains specifically targetted at real estate (if they're serious about getting people away from investing in several properties). They can designate the 'principal' resident home as being capital gains exempt but rental properties and the such can slowly be exposed to the capital gains tax. For example in 2 years time they can introduce a 25% taxable capital gain. In Canada, only 50% of any capital gain is taxable - I remember 10 years ago it use to be 75%. A similar varying of the % taxable can easily be implemented in NZ with minimal consequences.
As of interest, the US has full 100% capital gains tax on everything including their principal house they live in. However, the home owner can deduct the mortgage interest off their tax return every year. This has never been an allowance for in Canada - deduction of interest expense from 1 venture to offset gains in another income adventure. Though i've heard of people in Australia doing a lot of this "negative gearing" but I think that's all changed now - and NZ IRD doesn't recognise it either? In a different thread, i've mentioned that NZ does have full capital gains tax on any real estate venture as long as IRD can prove the purpose of the venture was speculative. We often read in the newspaper of house so many people are caught buying & selling real estate with the assumption that the gains are 100% tax free.
The NZX top 10 has had incredible gains in the past 5 years indeed. I hope you were able to lock in some of those gains
BQ