Dr Elizabeth Green is the National Trust's Senior National Curator for Architectural History and for Wales and has been a curator within the National Trust, in Wales and Northern Ireland, since 2002. Previously, she spent eight years in private practice specialising in historic building analysis and adaptive reuse. Her principal interests lie in mediaeval, vernacular and Welsh architecture and temporary structures, on which subjects she has written widely. George Clarke is an architect, television presenter, campaigner and educator.