Join Knepp’s Isabella Tree and an over-excited Matthew Oates, the purple emperor’s No 1 devotee, to celebrate a bonanza year for this rare, beautiful and thuggish butterfly. Numbers at Knepp have broken all records and Matthew takes us to three of the emperor’s favourite haunts in the hope of catching a last glimpse of His Imperial Highness as the flight season draws to a close.

Matthew explains why this has been the butterfly year of his life and his hopes for the future as habitat for the purple emperor and others begins to improve in Britain.

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