from a high resolution scan and meticulously restored.
Versions of this plan were displayed in Television Centre as shown in image 3.
Please see my other listings for posters & a mousemat of the same image.
Further reading:
http://desertedplaces.blogspot.com/2013/02/bbc-television-centre-end-of-era.html
http://www.theproductionlist.com/bbc-television-centre-history/