There's discussion of imaginative histories of Weather and Twilight with Alex Harris and Peter Davidson. They'll be explaining why painters first noticed the witching hour at the end of the 18th century, and why Anglo-Saxons only told stories about the winter, why April showers were precious in the middle-ages and fog was the novelists' weather of choice in the 19th century.

Plus the poet Michael Rosen, whose new anthology links anti-Semitism, fascism and war with the lives of his parents and grandparents, joins Matthew in the great outdoors to remember the Kibbo Kift Kin, the 1920s youth movement which combined woodcraft with cutting edge costume and art and arcane and possibly occult dreams of changing the world forever.

The Kindred of the Kibbo Kift, a new book by Annebella Pollen accompanies Intellectual Barbarians, an exhibition at London's Whitechapel Gallery, marking the short but colourful history of an organisation which fell foul of both Right and Left.