Based on the edge of the 'Dark Peak' region of the Peak District National Park, Castle Green and Langsett Highland Ponies graze the Pennine hills of South Yorkshire at altitudes of around 800 feet above sea level, living out all year round. This provides them with the same natural setting as they would experience in their native Highlands of Scotland.

The first foals to be bred as part of this small herd were born in 1978, although the prefix/suffix 'Langsett' wasn't registered until 1986 and 'Castle Green' wasn't registered or used until 1993. Since then, on average one foal per year has been produced. The general aim is to create stock which is of quality; strong, hardy and active, making the ideal performance and show pony.