When I was growing up in Norfolk, we often had butterflies indoors in winter. They would hibernate in the curtains etc then be tempted out when it got warm (pre central heating). They wouldn't survive outdoors though. The winter may have been hyper mild so far, except for some chilly bits up here, but there's plenty of time for all the unseasonal plants and creatures to be killed dead by the cold and wind. We have blizzards forecast for tonight, with strong winds. I find it sad.