The water vole is one of Britain's most endangered mammals. Here, Christine Gregory tells the story of the water vole, past, present and future, principally through its history in the waterways of Derbyshire. Having spent several years studying Derbyshire's water vole population and habitats, and capturing their behaviour intimately through her photography, Christine has developed a relationship with many of the custodians of the county's waterways, who are vital to the survival of the water vole.