The Londonist website, which is devoted to promoting London, has an article on its website listing interesting London libraries, with a short write-up on each. The first of these is that of the SPR.
The article, dated 26 August 2015, is entitled 'What do Nazies, Stamps and Poltergeists Have in Common?', the link being that each has a library covering it in London
The article can be found here:
http://londonist.com/2015/08/london-s-lesser-known-libraries