Just found out to my cost that computer printers (at least HP and Epson) are regionalised, rather like DVD players, which means that even if you can get ink cartridges UK printers will not work in NZ. I brought spare cartridges with me and have now run out and am left with a couple of expensive footstools.
Can't see the logic behind it except possibly to sell more printers, Epson NZ customer services reaction when I called was basically "tough, buy a new printer"