Brighton, possibly, though it’s not a port. There’s no Dover in NZ as far as I can tell.
Hope its not Gravesend ![]()
Plymouth? There’s New Plymouth in New Zealand.
Another vote for Manchester, especially only England. For Scotland it would be Edinburgh and Glasgow equally, for Wales Cardiff and Belfast for Northern Ireland.
North Kilttown
Birmingham is my next thought after London. I have a friend who was born there.