British passport holders can enter New Zealand as a visitor for up to 6 months on arrival without a visa, provided you can satisfy an Immigration Officer that you meet the requirements of the immigration rules. Visitors must have an onward ticket.
Working holiday visas are available to young people, usually aged 18-30, but 18-35 in a select few countries. They let you travel and work in New Zealand for up to 12 months, or 23 months if you’re from the UK or Canada. You need to have a return ticket, or enough money to pay for one, and be coming mainly to holiday, with work being a secondary intention. For more information, click here.