I’ve mentioned before Deeper than Indigo, Jenny Balfour Paul’s account of travels inspired by a Victorian adventurer, Thomas Machell, with whom she shares a love of India, a career in indigo (she is one of the world’s leading experts) and a passion for journal writing. The author will be speaking on Tuesday in Tiverton, Devon, as part of a series of events organised by the South-West regional committee of the Royal Geographical Society.