New Zealand Law
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He will need to apply for a visa from the British High Commission who are at
UK Visas and Immigration Private Bag 115–770 Shortland Street Auckland 1140
He can apply online at this link https://www.gov.uk/apply-uk-visa
He will need a copy of his criminal record and likely will need letters of support to say this is behind him.
They will want to know about the conviction and the background so he will need to get the sentencing reports and any parole reports as well.