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There are over a billion people with some sort of disability in the world. How are we changing the built environment to accommodate this? As well as wheelchair users, people with conditions from autism to asthma – hidden disabilities – have needs as well. Presenter Vishala Sri-Pathma speaks to Sara Marchant at Gatwick Airport in London, which has come up with a novel system to help people with a hidden disability to identify themselves if they need assistance from staff. Victor Pineda, a social development scholar and disability rights advocate, says there are many challenges for the physically and visually impaired, but new designs that help disabled people shouldn’t cost more. (Picture: a woman climbing stairs burdened by an elephant. Credit: Getty.)