Rob Hopkins and Helen Castor

Harriet Gilbert and her guests - historian, Helen Castor and sustainability activist, Rob Hopkins, - discuss their favourite books by John Stewart Collis, William Golding and Marcelo Figeras.

Rob Hopkins' choice: 'The Worm Forgives the Plough' by John Stewart Collis Publisher: Random House

Helen Castor's choice: 'The Spire' by William Golding Publisher: Faber and Faber

Harriett Gilbert's choice: Kamchatka by Marcelo Figeras Publisher: Atlantic Books

Producer Christine Hall

First broadcast on BBC Radio 4 in July 2012.