See Hear: Revisiting a 1973 documentary about deafness
5 May 2014 Last updated at 03:21 BST
Two people who appeared together in a 1973 Horizon documentary about deafness are reunited for the first time in more than 40 years, in order to revisit the show and explore how attitudes towards deafness have changed.
Lydia Handscomb, who is deaf, was in her 20s when Curtain of Silence first aired. She is featured using an experimental machine aimed at helping her understand speech sounds through vibrations in her finger tips, in order to try and improve her speaking ability.
Watching the documentary, together with the research doctor who carried out the tests, Handscomb wishes she'd been encouraged to use sign language rather than speak.
"As a deaf person the only thing I want to do is sign. I can't help it! It's important to be visual."