WI National Wins 1957 NZ election

What if the National Party won the 1957 New Zealand election instead of the Labour Party? Keith Holyoake would be Prime Minister of New Zealand at least until 1960 instead of Walter Nash. I did this by having National win all the seats Labour won with a majority of 600 or less, and applied the swing nationwide.
1957 New Zealand election
Keith Holyoake-National: 43-2 46.29%
Walter Nash-Labour: 37+2 46.23%
80 seats
41 for majority

Labour loses Lyttleton, Nelson, St Albans and Tamaki, and among those losses are Norman Kirk and Bob Tizard.
How could such a result occur-what PoD would be needed? What would be the effects? Labour would likely have a change of leadership, Nash was nearly overthrown in 1954 and now he would have lost 3 elections. The most likely replacement looks like Arnold Nordmeyer, but I'm not sure if Nordmeyer could win back power for Labour. How would National govern in this period? Would there still be the Black Budget of 1958? With the balance of payments crisis(that National hid from the public during the election and forced Labour to abandon its 'election bribe' election promises) would 1957 be a poisoned chalice? Would Labour win in 1960 and govern for the 1960s? Or would National keep power well into the 1960s? What if?
 
1957 was a poisoned chalice. Basically, Holyoake's Government would have to deal with the Balance of Payments Crisis. Labour under Nordmeyer wins 1960 easily, and takes advantage of the 1960s economic boom in the way the OTL Nats did. I think Holyoake might have stuck around to lose 1963 - party leaders tended to hang around more in those days.

This probably butterflies New Zealand's involvement in Vietnam, with the proviso that Holyoake himself wasn't keen on it.
 
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