Eva Green rose to fame as the Bond girl who won the heart of 007 in Casino Royale. Now she's back in more familiar territory as the elemental, mysterious Morgan in Camelot, she tells Elizabeth Day – dabbling in witchcraft and reinventing nudity

It is a sunny, blue-sky day when I meet the actress Eva Green. The London streets are peppered with cherry blossom and the heady scent of fake tan hangs thickly above the city like ozone. It is a day for white linen and flowing dresses and flip-flops. But when Green arrives, it is clear that she is not embracing the joys of spring time. Her tiny frame is swathed in black and dark grey and she is wearing a heavy coat over a lace blouse, jeans and boots. The pale flawlessness of her face is accentuated by jet-black hair and smudged eye-shadow the colour of coal dust. The overall...