In the end one of the right wing party's lawmakers voted with the left wing party, enough to pass a law, the right wing party used this as an excuse to dissolve parliament and call a national election which they resoundingly lost (the reasons this happened had more to do with the right wing party lying about the state of the economy and getting caught - but a mandate's a mandate) - we don't get nuclear weapons sailing into our country any more
Muldoon as PM used the loss of the nuclear ships vote as an excuse to call an election, but was caught out when the chairman of the Reserve Bank came out publicly and explained what was happening to the economy, by then of course it was all too late. Nevertheless we were proud of our Nuclear Free state, even more so when the French terrorists sunk the Rainbow Warrior in Auckland Harbour (remember that the previous Labour govt had sailed NZ navy frigates into the French nuclear testing zone to protest atmospheric testing, this wasn't a new thing for Labour)
I headed off on my OE the day after Marilyn Waring crossed the floor, by the time I arrived in the US and had opened a bank account my (still in NZ) savings were worth less than half ... not a fan of the National Party 's economic savvy