Invention of communication satellites

Over on my Google Sites wiki I've added a page on how Arthur C Clarke developed the idea of the geostationary communication satellite.  The idea resulted from the question I posted in an earlier blog, but as I could find no other mention of this earlier letter on the web I felt I ought to post copies of the pages and a little background information.   

As always one thing leads to another, and now I'm tempted to find out more about the BBC Brains Trust radio programs on which the Wireless World Brains Trust was based.