Richard Greenaway can often be seen wandering around Christchurch's cemeteries, leading a group of people interested in the stories behind the headstones. He's going to be frequenting the cemeteries a lot over the next few weeks, taking tours as part of the city's Festival of Heritage. The former librarian has spent years researching those buried there, many of them characters who'd long been forgotten until he dug up their stories. Lynn Freeman asked Richard how he got interested in researching cemeteries: