Birch Vale is a village in the High Peak district of Derbyshire, just outside the boundary of the Peak District National Park, between New Mills and Hayfield. Most of Birch Vale, including the attached hamlet of Thornsett, comes under the administration of New Mills Town Council, though the small part to the east of the former Grouse Inn public house is within …Birch Vale is a village in the High Peak district of Derbyshire, just outside the boundary of the Peak District National Park, between New Mills and Hayfield. Most of Birch Vale, including the attached hamlet of Thornsett, comes under the administration of New Mills Town Council, though the small part to the east of the former Grouse Inn public house is within the boundaries of Hayfield.