Here is a non-exhaustive list of other relevant organisations with an interest in social history that you may find useful.
Elstree Screen Heritage Elstree Screen Heritage was founded in 2006 to record, preserve and share our unique film and television heritage
Herts Memories Herts Memories enables members of the public to share and enjoy photos, memories and historical research on Hertfordshire.
Local Population Studies Society LPSS is solely devoted to the promotion of all aspects of historical demography in a local context. It publishes the internationally renowned journal Local Population Studies.
Out of Sight, Out of Mind The Out of Sight, Out of Mind? project in St Albans is a record of the former mental hospitals in the area including Hill End, Napsbury, Cell Barnes, Harperbury, Leavesden and Shenley.