What is so brilliant about the gadgets is their simplicity.

Llewelyn made a brief appearance in "Little Mother" an episode of The Adventures of Robin Hood. The house is now used as a care home for the elderly. In the 1977 film The Spy Who Loved Me as 'Q' was delivering the underwater Lotus Major Anya Anasova/Agent XXX (Barbara Bach) greets 'Q' as "Major Boothroyd".