Montagu is a graphic designer and Head of Heritage at
Radio Times. He is credited as a co-producer of
Lord Montagu — a documentary about his father — and a series of short films about the stars of the TV comedy series ''
Dad's Army''. He is the president of the Solent Protection Society, a governor of
Walhampton School and a director of Beaulieu Enterprises Ltd. He also a trustee of the National Motor Museum Trust, the Countryside Education Trust and the Hampshire Archives Trust. Concerned that local residents were being priced out, Montagu worked to secure social housing in the village of Beaulieu. ==Personal life==