According to Wikipedia (so it must be correct, right?!) "Vanessa gonerilla" is the scientific name of the New Zealand Red Admiral butterfly.
Apparently, the "adults can live for many months, including in winter, when they become dormant and fly only on warmer days".
It wasn't winter, in fact it was mid-December, when one fluttered, presumably inadvertently, into our lounge. Before Desiree had released it back into the wilderness we laughingly call our backyard, I managed to capture these quick images: