Festival also includes novelist Kate Mosse and explorer Ranulph Fiennes . The festival is the brainchild of British entrepreneur Simon Fuller, who has been involved in a number of other successful events including the London Marathon, the Edinburgh Fringe Festival, the Glastonbury Festival and the World Economic Forum in Lord Fellowes will discuss huge social change brought by First World War .
Festival also includes novelist Kate Mosse and explorer Ranulph Fiennes . Event attracts more than 30,000 visitors to idyllic venue in Wiltshire field . Lord Fellowes will discuss huge social change brought by First World War .