In 1886, Mitford inherited the substantial country estates of his first cousin twice removed, John Freeman-Mitford, 1st Earl of Redesdale. In accordance with the will he assumed by Royal licence the additional surname of Freeman. Appointed a Deputy Lieutenant for Gloucestershire, he became a magistrate and took up farming and horse breeding. He was a member of the Royal Yacht Squadron from 1889 to 1914. Redesdale joined the Royal Photographic Society in 1907 and became a Fellow in 1908. He was President of the Royal Photographic Society between 1910 and 1912.