I will probably come back to this later dh is hovering and it's putting me off 
Can I ask some questions of you all though
Ath do you plan to stay?
Lavender I will PM you later (and explain why I will PM you) really it's because I've wanted to say that for ages 
certainly Wiltshire to London is a big commute we looked into commuting but couldn't find anywhere on the 'right' train line to live in IYSWIM
Mac you say you went to a crap secondary then Vic and did allright without asking too much can I ask what you mean by 'allright'?
Vic is a pretty good university I think, do you think it's easier to get into Vic from a crap secondary in NZ than it is to get in to a comparably good uni in the UK? might be part of it Vic kind of neutralising the crap secondary IYSWIM
One of my concerns is the future for the dcs (lack of competativeness on the international market....)
Sibble can I ask 2 nosy questions
how do you manage to get time off work to spend the month at the beach? Do you not get much off the rest of the year?
have you had the bach for ages?
(relavance of that being price increases would maybe preclude someone coming here more recently from ever owning one taking out that experience from them (I know prices are much more expensive in UK...) your community sounds really nice we left free swimming in UK (I know it's gone now) and here we pay ++, are in an area with few pools so it's all crowded etc etc. Although we are especially underpooled for NZ I think.
I have seen very few holiday activities here compared to the UK (admittedly I'm not working so am not really looking for them but in London you were literally falling over them).
Now to answer some questions and help a few people maybe.....
Beta if you are here on a residents visa I don't think you'll need health insurance (do you have private healthcare in the UK?) did I hear you right that you are coming over for 1 month and putting the dcs into school? I would check your visa includes that we have had to produce passports everywhere here, school, Docs, hospital A&E everywhere!!
The last poster relocation is short term a larger salary will go on and on how much are they offering for relocation?
Beaver I wouldn't nec. discount Wellington you might be able to find somewhere less windy but it is a city (obviously)
Interesting on the cost side of things I saw the Oz posters posting similar things recently, I think the true cost of living hasn't really hit in the UK yet.
Now 2 things that are different here are that our kindy takes applications based on date of birth not date registered much more sensible, schools seem to take everyone in their catchement (consequently for good schools the area can get smaller and smaller) it does mean you get more composite classes.