Flying to New Zealand - need cheap flights?

3 people - all on the same flight - adults,
I need the flights to be about 2 weeks stay return (I have somewhere to stay). Roughtly from the 24 of February to the 10 of March +/-.
Departing from Heathrow London UK, to Auckland international New Zealand. I don\'t mind departing from any London Airport.
They flights I found are roughly 27 hours long each way. (that includes stop offs etc).
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