Park Authority, the Association of National Park Authorities, the Council for National Parks, the Campaign to Protect Rural England (CPRE), the Ramblers' Association, and the Duchy of Cornwall. Conservation work Sayer was described in The Times newspaper in 1971 as "a militant conservationist, who is a full-time thorn in the sides of those authorities and others who want to flood, fence, dig up, knock down and otherwise damage the Dartmoor national park." Crispin Gill wrote about her in his introduction to Dartmoor – A New Study published in 1970 as having "roused the conscience of a [vast] number of people" and he described her as an indefatigable worker with an enormous knowledge; he also referred to Henry Slesser's description of her as "the shield of the moor". She regularly wrote letters to newspapers, both local and national, about matters related to Dartmoor. In her first published letter to The Times, in 1948, she expressed concerns about local authorities (specifically Devon County Council) seeking to subvert the implementation of Arthur Hobhouse's recommendations for the creation of national parks by demanding that they retain their own planning powers. She noted that local authorities had been unable to control development by Government departments in areas such as Dartmoor, referring to the 32,800 acres held by the Admiralty and War Department and the 3,763 acres that had been taken by the Forestry Commission. She also referred to Dartmoor's uniqueness in that most of it was owned by the Duchy of Cornwall which, as a department of the Crown, could basically do what it liked with its land. She urged that control of the soon-to-be-formed National Parks should be at the highest possible level within the Government so there would be a chance of exercising control over the Duchy and other Government departments. The National Parks and Access to the Countryside Act 1949 created the National Parks Commission whose first chairman was Sir Patrick Duff. Ten National Parks were created in the 1950s under this Act – Dartmoor National Park was the fourth to be created, in October 1951. It was administered by Dartmoor National Park Authority which was a special committee of Devon County Council and subsidiary to the County Planning Committee which could veto its recommendations. Sayer was a member of the committee from its formation, but she resigned in 1957 in protest at its failure to protect the moor as she would