Just found this Sydenham site. Big article by Malcolm Baird, "The eye of the World. John Logie Baird and television."
Also more very interesting articles in links at bottom of page too....
"The Crystal Palace TV complex"
"Baird Independant TV"
"Baird High definition Colour TV"
All in all, a great read for anyone who hasn't seen these articles before.
Many references too.
http://www.sydenham.org.uk/john_logie_baird_00.html
Albert.