They go almost unnoticed if you visit a church, but church kneelers are essential, and have a long and storied history. Elizabeth Bingham, the leading authority on Anglican church kneelers, celebrates the design and craft of the cushions and delves into their history, from their beginnings at Winchester in the 1930s to their booming popularity after the Queen's coronation, to the present-day congregations who are keeping the tradition alive. She talks to novelist Kate Mosse.