I'm new to the Forum so hello everyone.  Sorry my first post is a plug, but I hope to get on to other topics too.
Anyone who worked in the BH area, particularly in the Langham, might be interested to know that I have published my diary for 1971.  At the time I was a junior secretary at the Schools Broadcasting Council in an office on the 6th floor of the Langham, so there is a lot in it about the people working there, and about a strange relationship I got involved in ... anyway, the book is available online from Lulu.com, or for more info please see http://1971secretsecretarybbc.blogspot.co.uk/.  
BTW I was surprised that it was so difficult to find a photo of the Langham from the 1970s, fortunately I had taken one myself in '71!  What an amazing place it was.