What, exactly is theatre? A festival sets up the question by inviting a diverse bunch of testifiers. “Connected in diverse ways to the performing arts, the Enquirers are an intriguingly mixed bunch, ranging from the artistic director of the Royal Shakespeare Company to a 14-year-old pupil at Holland Park School, and from a Buddhist monk who is the caretaker of the London Peace Pagoda to the chair of the British Council. Groups as well as individuals have been recruited. The liberating twist is that testimony need not be given as a conventional talk. It can be presented as a performance piece, or an installation, or however the testifier sees fit.”