I stumbled on this and couldn't resist sharing it:

"In 1948 the Board of Governors of the BBC asked the head of the Variety Department, Michael Standing, to devise a guiding set of moral standards and protocols for the production of all BBC radio and television programmes. Standing produced what became known within the BBC as the 'Green Book', whose purpose was to eradicate smut, innuendo and vulgarity from all BBC programmes. After producing the book Standing took to implementing his guidance with eccentric zeal. In June 1949 he issued a memo to all staff in which he forbade BBC employees to illuminate any room with an Anglepoise lamp unless the main ceiling or wall light was also illuminated: Standing held a firm belief that a man working at a desk in a confined space with only the light from a low-wattage lamp would nurture furtive ideas and produce degenerate programme material. Director General Sir William Haley later rescinded the Anglepoise lamp edict as extreme and unnecessary." (John Birt )