Judy Ovens is an accredited Lambeth tour guide. She is a co-founder of the architecture education charity, Our Hut (www.ourhut.co.uk), with Lucy Lavers and Suzanna Prizeman, and together with them has written two books about ventilation shafts, Inventive Vents: A Gazetteer of London’s Ventilation Shafts and Adventurous Vents: A Journey through the ventilation shafts of Britain (pub. Particular Books October 2025)