Mary Montagu-Scott has one sibling from her parents’ marriage, Ralph Douglas-Scott-Montagu, 4th Baron Montagu of Beaulieu. He is the current Baron Montagu of Beaulieu. Her parents divorced in 1974, and her father married his second wife, Fiona Margaret Herbert, in the same year. They have a son, Hon. Jonathan Deane Douglas-Scott-Montagu. Career 
Mary Montagu-Scott trained in Theatre Design at the Central School of Art and Design, London. She set up Mary Montagu Designs, an interior design business working on many residential and commercial design projects. She is the chairman of New Forest Ninth Centenary Trust, which runs the New Forest Heritage Centre, a trustee of the National Motor Museum Trust, and a trustee of The National Museum of the Royal Navy 

She is currently the director of Beaulieu Enterprises Ltd, Beaulieu.
Mary Montagu-Scott has one sibling from his parents’ marriage, Ralph Douglas-Scott-Montagu, 4th Baron Montagu of Beaulieu. He is the current Baron Montagu of Beaulieu. His parents divorced in 1974, and his father married his second wife, Fiona Margaret Herbert, in the same year. They have a son, Hon. Jonathan Deane Douglas-Scott-Montagu. Career 
Mary Montagu-Scott trained in Theatre Design at the Central School of Art and Design, London. She set up Mary Montagu Designs, an interior design business working on many residential and commercial design projects. He is the chairman of New Forest Ninth Centenary Trust, which runs the New Forest Heritage Centre, a trustee of the National Motor Museum Trust, and a trustee of The National Museum of the Royal Navy. He is currently the director of Beaulieu Enterprises Ltd, Beaulieu.