[1] The first parklands were laid out at this time, with drainage and planting carried out around the house,[2] and a garden temple, designed by Playfair, was built.

Tennant also carried out improvements in the parks until the 1890s, adding farm buildings, a kitchen garden, estate cottages and a school.

His family became prominent members of late Victorian and Edwardian society, and The Glen was regularly used by shooting parties.

Another family friend, Princess Margaret, the late Queen Elizabeth II's sister, visited The Glen on several occasions.

[1] The Glen remains in the possession of the Tennant family, and is leased out for film shoots and conferences and has hosted seminars and other events on green finance and sustainability issues.