I have found a design by J. G. Ransome in the Jan,Feb,March,April issues of Practical Television, with a little extra info in the June issue p407 too.
https://worldradiohistory.com/UK/Practical-Television/search.cgi?zoom_sort=0&zoom_xml=0&zoom_query=1964
https://worldradiohistory.com/UK/Practical-Television/search.cgi?zoom_sort=0&zoom_xml=0&zoom_query=1964







