William Woollard illustrates some of the changes taking place in electronic communication systems - with the help of Prestel, a word processor and a home computer - and comments on the success of Voyager One's encounter with Saturn.
Jenny, in the 21st century, hears about a plan to build a space elevator based on the idea of Arthur C. Clarke.
With Jayne Lester, Rosemary Frankau, Nicholas Young, Iain Anders