In this passionate documentary, Chris Packham looks at the notorious nature invaders – and whether we should love or loathe those flashes of neon green in our skies In this passionate documentary, Chris Packham looks at the notorious nature invaders – and whether we should love or loathe those flashes of neon green in our skies ’Twas a grim February teatime in West Wickham, south London, when I saw my first parakeet. About six of them, in fact. I looked up from doing the dishes, through the